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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Gohin, Alexandre; Gohin, Alexandre;

    [Paper in French] The European public policy in favor of the biodiesel consumption is highly debated. Available estimates of the induced land use changes conclude that this policy is inefficient to reduce emissions of GreenHouse Gas. We show that the crop yield evolutions in these estimates are significantly lower than the observed and expected evolutions. This difference is directly related to biased calibration choice of behavioral parameters. We show using the GTAP-BIO framework that a consistent calibration of these parameters leads to a strong reduction (by around 80% in the long run) of the land use changes and induced emissions.

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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
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    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    ProdInra
    External research report . 2013
    License: CC BY SA
    Data sources: ProdInra
    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    https://dx.doi.org/10.22004/ag...
    Other literature type . 2013
    Data sources: Datacite
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ Hyper Article en Lig...arrow_drop_down
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      ProdInra
      External research report . 2013
      License: CC BY SA
      Data sources: ProdInra
      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
      https://dx.doi.org/10.22004/ag...
      Other literature type . 2013
      Data sources: Datacite
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Stolyarova, Elena;

    Little research has been done to date on French households’ preferences for energy retrofits in the dwelling. However, the economic role of these choices is crucial for implementing an effective and realistic energy policy in the residential sector, both in terms of proposed aid and targets. Are households interested in retrofits with high energy-savings potential? How much are they willing to pay and is it sufficient to cover the up-front costs? How many households have no choice of heating system, and what is their profile?This work sets out to answer these questions empirically using discrete choice models. It starts by analyzing the technical, socio-demographic and spatial constraints that face households and create barriers to domestic energy choices. A method to detect household constraint is devised and applied to the choice of space heating system in 2006 and 2013. The second stage analyzes household preferences for heating equipment and retrofits. This second part is based on a discrete choice experiment specially carried out for this research among 2,000 households. This work sheds light on households’ preferences and heterogeneity, as well as their willingness to pay, the implicit discount rate and other economic impacts. Les préférences des ménages français pour les travaux de rénovation énergétique dans le logement ont été peu étudiées jusqu’à présent. Or, elles sont la clé d’une politique énergétique efficace et réaliste pour le secteur résidentiel, tant au niveau des aides proposées, qu’au niveau des objectifs à réaliser. Les ménages sont-ils intéressés par des travaux à fort potentiel d’économie d’énergie ? Combien sont-ils prêt à payer et est-ce que c’est suffisant pour couvrir les coûts réels ? Combien de ménages n’ont pas le choix de leur mode de chauffage et quel est leur profil ?La thèse s'attache à répondre à ces questions de façon empirique à l’aide de modèles de choix discrets. Il s’agit, dans un premier temps, d’analyser les contraintes techniques, sociodémographiques et spatiales que rencontrent les ménages et qui entravent les choix énergétiques dans le logement. Une méthodologie de détection des ménages contraints a été proposée, puis appliquée au choix du chauffage en 2006 et 2013. Dans un deuxième temps, les préférences des ménages pour les équipements de chauffage et les travaux de rénovation ont été analysées. Cette deuxième partie utilise une enquête expérimentale qui a été réalisée spécialement pour ce travail de recherche auprès de 2000 ménages. Ce travail a permis de comprendre les préférences des ménages, leur hétérogénéité, et d’en déduire les consentements à payer, les taux d’actualisation implicites et les différents effets économiques.

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Adami, Salah-Eddine;

    Les progrès réalisés durant ces dernières années dans le domaine de la microélectronique et notamment vis-à-vis de l'augmentation exponentielle de la densité d'intégration des composants et des systèmes a participé activement à l'apparition et au développement de systèmes portables communicants de plus en plus performants et polyvalents. La R&D dans les technologies de stockage d'énergie n'a pas suivi cette tendance d'évolution très rapide ; ce qui constitue un handicap majeur dans les évolutions futures des systèmes portables. La transmission d'énergie sans fils sur des distances considérables (plusieurs dizaines de mètres) grâce aux microondes constitue une solution très prometteuse pour pallier aux problèmes d'autonomie dans le cas des systèmes sans fils communicants. De plus, du fait de l'omniprésence des ondes électromagnétiques dans notre environnement avec des niveaux plus ou moins importants, la récupération et l'exploitation de cette énergie libre est également possible. La rectenna (Rectifying Antenna) est le dispositif permettant de capter et de convertir une onde électromagnétique en une tension continue. Plusieurs travaux de thèse axés sur l'étude et l'optimisation de la rectenna ont été réalisés au sein du laboratoire. Ces travaux avaient montré que pour des faibles niveaux de champs les tensions délivrées par la rectenna sont généralement très faibles et inexploitables. Aussi, comme la majorité des micro-sources d'énergie et à cause de son impédance interne, les performances de la rectenna dépendent fortement de sa charge de sortie. Ainsi, le développement d'un système d'interfaçage de la rectenna est nécessaire afin de pallier ces manquements inhérents du convertisseur RF/DC. Ce genre de système d'interfaçage est généralement absent dans la littérature à cause des faibles niveaux de puissance exploités. Par conséquent, la rectenna est très souvent utilisée tel quelle ; ce qui limite fortement le champ applicatif. Dans ce projet de recherche, un système de gestion énergétique de la rectenna complètement autonome a été conçu, développé et optimisé afin de garantir les performances optimales de la rectenna quelques soient les fluctuations de la puissance d'entrée et celles de la charge de sortie. Le circuit d'interfaçage permet également de fournir à la charge des niveaux de tension utilisables. Le système réalisé est basé tout d'abord sur l'utilisation d'un convertisseur DC/DC résonant pouvant fonctionner d'une manière complètement autonome à partir de niveaux très bas de la tension et de la puissance de la source. Ce convertisseur permet donc de garantir l'autonomie du système en éliminant la nécessité d'une source d'énergie auxiliaire. A cause de ses faibles performances énergétiques, ce convertisseur ne sera utilisé que durant la phase de démarrage. L'efficacité du système en termes de rendement énergétique et d'adaptation d'impédance est garantie grâce à l'utilisation d'un convertisseur Flyback fonctionnant dans son régime de conduction discontinu. Ainsi, une adaptation d'impédance très efficace est réalisée entre la rectenna et la charge de sortie. Ce convertisseur principal fonctionnera durant le régime permanent. Les deux convertisseurs ont été optimisés pour des niveaux de tension et de puissance aussi bas que quelques centaines de mV et quelques μW respectivement. Des mesures expérimentales réalisées sur plusieurs prototypes ont démontré le bon fonctionnement et les excellentes performances prédites par la procédure de conception ; ce qui nous permet de valider notre approche. De plus, les performances obtenues se distinguent parfaitement vis-à-vis de l'état de l'art. Enfin, en fonction de l'application désirée, plusieurs synoptiques d'association des deux structures sont proposés. Ceci inclut également la gestion énergétique de la charge de sortie.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ INRIA a CCSD electro...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ INRIA a CCSD electro...arrow_drop_down
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    Authors: Martz, François;

    During this PhD thesis we developped two new molecular modeling methods applied to enzymes containing flavin-type prosthetic groups.The first method, PredFace, predicts the stereochemistry of products from a reaction catalyzed by enzymes containing prosthetic groups, by automatically identifying the solvent-exposed face of the prosthetic group. The protocol involves the use of eigth complexes as "probes", obtained by symmetry operations starting from the transition state of a hydrogen atom transfer reaction between nicotinamide and lumiflavin. These complexes are positioned in the binding site with the prosthetic group as reference and the energy of the protein-ligand interaction is evaluated by the scoring function implemented in the docking software (AutoDock). The most favorable interaction energy allows the identification of the prosthetic group face that is available for the enzymatic reaction in the binding site. The PredFace method has been validated by analyzing all the structures in the Protein Data Bank containing flavin-derived prosthetic groups (2170). This method is very fast (less than a minute), which allowed us to develop a web site open to the scientific community.The second method, ProsthDock, is a new mechanism-based molecular docking method guided by prosthetic groups present in the active sites of enzymes. The development of this method was motivated by the incapacity of the currently available docking methods to provide, in the presence of prosthetic groups, ligand conformations that are compatible with the enzymatic reactions. In this regard, we have added a new term to the classical scoring function, to take into account the interaction between ligand and prosthetic group. We have built a simplified model of the NADH/FMN complex and calculated the transition state of the hydrogen transfer reaction between the two partners. Potential energy surfaces have been calculated for this reaction by variating the angle, diedral angle and distance between the two reaction partners. A subsequent docking with constraints provides binding site conformations of the ligand for which the new term of the scoring function is calculated using the potential energy surfaces. This results in a new ranking of the docking poses, favoring those in agreement with the enzymatic reaction. Les travaux de cette thèse ont porté sur le développement de deux méthodes de modélisation des enzymes contenant des groupes prosthétiques de la famille des flavines.La première méthode, PredFace, permet de prédire la stéréochimie des produits d'une réaction catalysée par des enzymes contenant des groupes prosthétiques, en identifiant la face libre d'interaction avec les substrats. Le protocole mis en place pour cette méthode implique l'utilisation de huit complexes "sondes", obtenus par des opérations de symétrie à partir de l'état de transition de la réaction de transfert d'un atome d'hydrogène entre le nicotinamide et la lumiflavine. Ces complexes sont positionnés dans le site actif avec le groupe prosthétique comme référence et dans chaque cas l'énergie d'interaction protéine-ligand est évaluée par la fonction de score implémentée dans le logiciel de docking utilisé (AutoDock). L'énergie d'interaction la plus favorable permet d'identifier la face du groupe prosthétique accessible pour la réaction enzymatique dans le site actif. La méthode PredFace a été validée par l'analyse de l'ensemble des structures de la Protein Data Bank contenant des groupes prosthétiques de la famille des flavines (2170). Le protocole mis au point est très rapide (moins d'une minute), ce qui nous a permis de développer un site web afin de mettre cette méthode à la disposition de la communauté.La seconde méthode, ProsthDock, est une nouvelle méthode de docking basée sur le mécanisme d'une réaction enzymatique catalysée par un groupe prosthétique et guidée par la présence de ce groupe prosthétique dans le site actif de l'enzyme. Le développement de cette méthode a été motivé par le fait que les méthodes actuelles de docking, en présence de groupes prosthétiques, se révèlent incapables de produire des poses correctes pour des substrats, en accord avec les réactions enzymatiques. Afin de remédier à ce problème nous avons ajouté à la fonction de score classique un terme supplémentaire, qui rendra compte de l'interaction du ligand avec le groupe prosthétique. Dans un premier temps, nous avons construit un modèle simplifié du complexe NADH/FMN et calculé l'état de transition de la réaction de transfert d'hydrogène entre les deux partenaires. Des surfaces d'énergie potentielle pour cette réaction ont été calculées en variant la distance, l'angle et l'angle dièdre entre les deux réactifs. Un docking sous contrainte est ensuite réalisé et en fonction du positionnement de chaque pose de docking dans le site actif le terme supplémentaire de la fonction de score est calculé à partir des surfaces d'énergie potentielle, ce qui nous permet de modifier le classement des résultats de docking en favorisant les poses qui sont en accord avec la réaction enzymatique.

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    Authors: Félix-Faure, Jim; Chanudet, Vincent; Walter, Christian; Dorioz, Jean Marcel; +5 Authors

    Les réservoirs résultant de la construction de barrages noient de la végétation et des sols. Leur évolution suit trois phases.[br/] - Dynamique initiale : les nouvelles niches écologiques ouvertes ainsi que les stocks de carbone et de nutriments contenus dans la végétation vivante et morte contribuent à une hausse brutale du niveau trophique et de la productivité des réservoirs. Ce phénomène, appelé « trophic upsurge », est d’importance et de durée variables. Il s’accompagne d’une désoxygénation et d’émissions de CO2 et de CH4, d’autant plus fortes que la température est élevée.[br/] - Dynamique à moyen terme : le marnage induit par l’exploitant exonde temporairement les sols noyés, qui sont alors soumis à l’érosion par le batillage des vagues. Dès que la pente dépasse 5 %, les matériaux érodés sont redistribués dans la zone toujours en eau, contribuant au « trophic upsurge » et à la sédimentation. Ces phénomènes ont été très peu quantifiés. Des résultats récents obtenus sur la retenue de Sarrans (Aveyron) suggèrent que ce phénomène est à l’origine d’une proportion importante de l’accumulation sédimentaire. L’influence écologique de l’apport de nutriments associé à la redistribution des sols pourrait être significative dans les environnements oligotrophes. On connaît très mal l’évolution des sols ennoyés au fond des retenues. Des observations préliminaires effectuées sur la retenue de Sarrans montrent que les sols conservent leur structure d’origine. Elles suggèrent aussi que des sols bruns de prairie, ennoyés en permanence depuis 80 ans, ou exondés occasionnellement, ont perdu 30 % de leur carbone, par minéralisation.[br/] - Dynamique à long terme : A long terme, ce sont les sols du bassin versant et de la zone de marnage en pente faible qui influencent l’écologie des retenues. Les sols du bassin versant dans la mesure où le contexte écologique influence l’érosion et l’apport de nutriments. Les sols de la zone littorale dans la mesure où ils soutiennent une production végétale, qui peut contribuer à filtrer l’eau, mais aussi à l’alimenter en carbone organique minéralisable. Il semble que l’émission de gaz à effet de serre par les réservoirs est, toutes choses égales par ailleurs, plus importante que celle des lacs naturels, probablement en raison de la forte sédimentation, et des variations de pression qui favorisent l’émission de CH4, en particulier lors du passage en turbine. Reservoir establishment results in the submersion of soils and vegetation. Their ecological evolution follows 3 main phases.[br/] - Initial: carbon and nutrients stored in living and dead vegetation biomass supply for a rise of the trophic level and productivity of the lake. During this phase, named « trophic upsurge », which duration and intensity are variable, water anoxia, CO2 and CH4 emissions also rise especially when temperature is high.[br/] - Mean Term: Water level fluctuates according to seasonal energy needs. Waves erode submerged soils along the shoreline. If the slope is steeper than 5%, soils are redistributed downslope and this flux contributes to the trophic upsurge and to sediment accumulation. These phenomena have been poorly studied and quantified. Our measurements at Sarrans reservoir suggest that soil redistribution is a major contributor to sediment accumulation. The ecological influence of carbon and nutrient inputs to the lake may be significant in oligotrophic environments. The evolution of permanently submerged soils is poorly known. Preliminary measurements at Sarrans reservoirs show that grassland cambisols (almost) permanently submerged have lost 30% of their original carbon store since impoundment.[br/] - On the long term, both catchment soils, through erosion and nutrient supply, and soils of the littoral zone, which support vegetation communities, influence reservoir ecology. The accumulation of sedimentary carbon in reservoirs appears much higher than in natural lakes, even eutrophic, and reasons for this are many. Greenhouse gas emission is also higher, because of higher sedimentation rate and increased water level fluctuations that favour methane bubbling and water degassing at the turbine outlet.

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    Authors: Ndiaye, Aminata; Ndiaye, Paul;

    Le changement climatique exige une compréhension de son fonctionnement pour bâtir des politiques de gestion efficaces, car la variabilité climatique contemporaine a engendré des bouleversements des écosystèmes naturels et produit une désarticulation sociale. Il est donc nécessaire de revisiter certains concepts clés (dégradation, ressources naturelles, acteurs, etc.), avant d'examiner la réalité de la dégradation environnementale, au regard de facteurs peu souhaitables par rapport auxquels il faut pourtant essayer d'esquisser un futur désirable. Les dynamiques environnementales en cours génèrent, en effet, des mutations peu avantageuses et conduisent à des conflits redoutables sur l'eau, la terre et toutes les autres ressources dites naturelles. Dès lors, de nombreux défis se font jour ; ils appellent des solutions qui tiennent compte à la fois de l'illusion et du forçage du destin, car les expériences douloureuses imposent la prudence, mais les potentialités indiscutables fondent, a contrario, de réelles ambitions de sortie des situations difficiles dans lesquelles se trouve l'Afrique. Il s'agit d'un pari sur l'avenir, pour le continent, en tablant d'abord, sur une triple durabilité (institutionnelle, socio-économique et environnementale) mais aussi, sur sa capacité à s'adapter à l'adversité du changement climatique et à améliorer l'utilisation peu efficiente de ses ressources naturelles par une option claire et holistique pour les stratégies d'intégration régionale. C'est le miracle que l'Afrique se doit de faire dès à présent, et pendant ce siècle ! Mots clés : environnement, dégradation, changement climatique, ressources naturelles, acteurs.

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    Authors: Sy, Sams Dine;

    While the level of uncertainty enriched by the climate wars hypothesis, controversial moves on the finance field. Breaking with development aid and the conventional financial system, the climate financing enters a period of radical uncertainty. Data and information collected over the COP held, can lay the groundwork for a financial prospective. The study proposes socio-economic and financial scenarios inspired by the IPCC approach in assessing transformation with representative socioeconomic evolution pathways. The vision of long-term cooperative action allows to raise more funds to expand developing countries participation in the effort of data collection, development of good practice and guidelines. But reducing the time taken for adaptation and mitigation may lead to more radical solutions are needed to lower the temperature. The study proposes that Africa should adhere to the vision of development erga omnes around a futureresilient financial system. The study recommends the setting of an Inter-Governmental Panel on Climate Financing to solve the problem of the transformation of global savings in very long term investment and to periodically report on the performance of the Global Investment Fund. Africa will also integrate the global value chain of carbon finance and to structure the innovation system with "clean tech" and "green business". Finally the study recommends several initiatives to provide financial support for large scale geoengeneering through reforestation, sequestration and storage of CO2 and solar radiation management. Keywords: Africa | climate | financing| prospective | resilience| development | innovation

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    Authors: African Capacity Building Foundation;

    Le Rapport sur les Capacités en Afrique (RICA) et les indicateurs qu'il propose offrent les intrants nécessaires pour éclairer les choix en matière d'appui au renforcement des capacités. Pour la plupart des pays, l'environnement institutionnel est très propice, et les processus de mise en œuvre sont en place. Cependant, les résultats de développement ne suivent pas, et encore moins les résultats en matière de renforcement des capacités. Le rapport et ses indicateurs soulignent également les réformes institutionnelles et en matière de règlementation qui sont nécessaires pour mieux soutenir les partenariats public-privé en matière d'investissement et de renforcement des capacités, ainsi que les investissements nécessaires pour renforcer davantage l'administration publique. De même, ils soulignent l'importance de la volonté politique dans l'inclusion sociale et le développement. Chaque rapport présente un thème annuel d'une importance clé pour le programme de développement de l'Afrique. Cette année, l'accent est mis sur les exigences de capacités pour l'intégration régionale, qui font partie du mandat de l'ACBF, et sur les capacités des communautés économiques régionales (CER). Le rapport dégage les points ci-après qui sont nécessaires pour renforcer les CER : intégrer le renforcement des capacités dans l'ensemble des efforts visant à réaliser un développement durable ; assurer des ressources administratives et financières suffisantes ; mettre l'accent sur la rétention et l'utilisation des compétences, et pas seulement sur leur acquisition ; et assurer le suivi-évaluation de tous les efforts de renforcement des capacités. Dans le cadre de l'intégration régionale, la dimension capacités est essentielle de nos jours puisque les pays, les CER, les institutions régionales spécialisées et les organisations régionales de développement, sont en train de développer des cadres stratégiques régionaux et de renforcer leurs capacités en vue de poursuivre l'intégration régionale à travers le continent. Les nombreuses ...

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    Authors: Ragazzi, Graziella;

    To face the climate change, energy transition is required. Energy transition is a societal transition, which is really challenging because of its singularities. The multi-level governance is necessary in order to act now for the energy transition. Indeed States take action by negotiating international agreements for the climate on the one hand, and on the other hand by legislating their national regulatory framework. Local authorities intervene too owing to their competencies which give them a high influence power on decentralized production system and on energy consumption. The local scale plays a major role because they benefit from closed and trustful relationships which foster collective action and act as a real leverage. It is at the territories level that energy transition projects emerge and that fight against global warming become true. That's why it is necessary to understand what types of local projects for the energy transition arise, and what is their economic, social and environmental performance. This can allow public authorities to identify what are the performant projects and to encourage to replicate them on the one hand, and on the other hand to remove barriers in order to make arise innovant projects. In the long run, we must understand what kinds of projects will unfold and generalize as part of the energy transition depending on the value they will generate. To answer this, the business models perspective is highly appropriate: it constitutes an analytical framework which allows to describe the project features (its value proposition, its value configuration) and to determine its viability and sustainability according to the (economic, financial, social, environmental) values creation it builds. The thesis puts forward a typology of energy transition business models at the local scale, an analytical framework for projects adapted to the energy transition societal stake. Finally the thesis suggests some public policy recommandation in terms of assessment of the economic, social and environmental performance of the local projects for the energy transition.; Face à l'urgence dans la lutte contre le réchauffement climatique, la transition énergétique bas carbone est une transition sociétale constituant un véritable défi du fait de ses singularités. Les conditions de sa réalisation résident dans un pilotage politique multi-niveaux afin d'agir dès à présent sur les différents leviers d'action possibles. En effet les Etats interviennent d'une part lors des négociations internationales afin de parvenir à un accord universel sur le climat, et d'autre part dans la législation de leur cadre réglementaire national. Les collectivités locales interviennent également du fait de leurs compétences leur conférant un pouvoir d'influence conséquent sur les modes de production décentralisés et sur la consommation d'énergie. L'échelle locale joue un rôle de premier ordre car elle bénéficie des liens de proximités et de confiance qui favorisent l'action collective et constitue un véritable effet de levier. C'est au niveau des territoires que les projets de la transition énergétique émergent et que la lutte contre le réchauffement climatique se concrétise. C'est pourquoi il est nécessaire de comprendre quels types de projets locaux pour la transition énergétique émergent, et quelle est leur performance tant d'un point de vue économique, que social et environnemental. Cela permettra d'une part aux pouvoirs publics d'identifier les types de projets performants pour impulser leur développement, et d'autre part quels sont les freins à lever le cas échéant pour faire émerger des projets innovants. Sur le long-terme, il s'agit de comprendre quels types de projets se déploieront et se généraliseront dans le cadre de la transition énergétique en fonction du type de valeur qu'ils parviendront à générer. Pour répondre à cela, l'approche des business models est pertinente : elle constitue en effet une grille d'analyse permettant de déterminer les caractéristiques de chaque projet, en décrivant sa proposition de valeur et la configuration de cette valeur, et de déterminer sa viabilité et sa durabilité en fonction de la création (ou destruction) de valeurs (économique, financière, sociale, environnementale) qu'il génère. La thèse propose ainsi une typologie des business models de la transition énergétique à l'échelle locale, une grille d'analyse de projet adaptée à l'enjeu sociétal que représente la transition énergétique et propose enfin des recommandations pour la politique publique en matière d'évaluation de la performance économique, sociale et environnementale de projets locaux de transition énergétique.

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    Authors: Plénet, Daniel; Jeannequin, Benoit; Chauvin, Jean-Eric;

    National audience; The fruit, vegetable and potato (FLP) sectors are characterised by a high structural diversity linked to the many species and varieties cultivated and to very varied production and marketing structures. The very strong competition imposed by the long distribution and import-export channels has gradually led, for reasons of economic rationality, to a specialisation of the production basins and part of the farms with standardisation of production means and products, but also the disappearance of many small farms. Overall, these changes have resulted in an erosion of surfaces and a decrease in the volumes produced for the majority of sectors with the exception of potatoes and certain nuts. Nevertheless, the dynamism of certain "product" sectors has led to a revival of competitiveness and/or a better Plénet D. et al. 80 Innovations Agronomiques 68 (2018), 79-105 development of the offer thanks to approaches relating to the development of high-tech systems, the reduction in the use of synthetic products, segmentation and commercial differentiation, and the creation of quality signs. In addition, the renewal of short and local circuits has recently made it possible to develop a very diversified network of farms in all regions. The emergence of high expectations for organic farming products and for healthy and sustainable agro-food systems offers new opportunities today. To benefit from them, the FLP sectors will have to develop coherent strategies to strengthen complementarities and synergies between different production, processing and marketing systems. These diversity enhancement strategies will contribute to increasing the economic and environmentalrobustness of the FLP sectors.; Les filières fruits, légumes et pomme de terre (FLP) se caractérisent par une diversité structurelle importante liée aux nombreuses espèces et variétés cultivées et à des structures de production et de commercialisation très variées. La très forte concurrence imposée par les circuits longs de la grande distribution et de l’import-export a progressivement entrainé pour des raisons de rationalité économique une spécialisation des bassins de production et d’une partie des exploitations avec une standardisation des moyens de production et des produits, mais aussi la disparition de nombreuses petites exploitations. Globalement, ces évolutions se sont traduites par une érosion des surfaces et une diminution des volumes produits pour la majorité des filières à l’exception de la pomme de terre et de certains fruits à coque. Néanmoins, le dynamisme de certaines filières « produit » a entrainé un regain de compétitivité et/ou une meilleure valorisation de l’offre grâce à des démarches portant sur le développement de systèmes à haute technicité, la réduction d’utilisation des produits de synthèse, la segmentation et la différenciation commerciale, et la création de signes de qualité. Par ailleurs, le renouveau des circuits courts et de proximité permet depuis peu de développer dans toutes les régions un tissu d’exploitations très diversifiées. L’émergence d’une forte attente pour les produits de l’agriculture biologique et pour des systèmes agro-alimentaires sains et durables offre aujourd’hui de nouvelles opportunités. Pour en bénéficier, les filières FLP devront élaborer des stratégies cohérentes afin de renforcer les complémentarités et les synergies entre différents systèmes de production, de transformation et de commercialisation. Ces stratégies de valorisation de la diversité contribueront à accroitre la robustesse économique et environnementale des filières FLP.

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11 Research products
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    Authors: Gohin, Alexandre; Gohin, Alexandre;

    [Paper in French] The European public policy in favor of the biodiesel consumption is highly debated. Available estimates of the induced land use changes conclude that this policy is inefficient to reduce emissions of GreenHouse Gas. We show that the crop yield evolutions in these estimates are significantly lower than the observed and expected evolutions. This difference is directly related to biased calibration choice of behavioral parameters. We show using the GTAP-BIO framework that a consistent calibration of these parameters leads to a strong reduction (by around 80% in the long run) of the land use changes and induced emissions.

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    ProdInra
    External research report . 2013
    License: CC BY SA
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    https://dx.doi.org/10.22004/ag...
    Other literature type . 2013
    Data sources: Datacite
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      ProdInra
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      https://dx.doi.org/10.22004/ag...
      Other literature type . 2013
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Stolyarova, Elena;

    Little research has been done to date on French households’ preferences for energy retrofits in the dwelling. However, the economic role of these choices is crucial for implementing an effective and realistic energy policy in the residential sector, both in terms of proposed aid and targets. Are households interested in retrofits with high energy-savings potential? How much are they willing to pay and is it sufficient to cover the up-front costs? How many households have no choice of heating system, and what is their profile?This work sets out to answer these questions empirically using discrete choice models. It starts by analyzing the technical, socio-demographic and spatial constraints that face households and create barriers to domestic energy choices. A method to detect household constraint is devised and applied to the choice of space heating system in 2006 and 2013. The second stage analyzes household preferences for heating equipment and retrofits. This second part is based on a discrete choice experiment specially carried out for this research among 2,000 households. This work sheds light on households’ preferences and heterogeneity, as well as their willingness to pay, the implicit discount rate and other economic impacts. Les préférences des ménages français pour les travaux de rénovation énergétique dans le logement ont été peu étudiées jusqu’à présent. Or, elles sont la clé d’une politique énergétique efficace et réaliste pour le secteur résidentiel, tant au niveau des aides proposées, qu’au niveau des objectifs à réaliser. Les ménages sont-ils intéressés par des travaux à fort potentiel d’économie d’énergie ? Combien sont-ils prêt à payer et est-ce que c’est suffisant pour couvrir les coûts réels ? Combien de ménages n’ont pas le choix de leur mode de chauffage et quel est leur profil ?La thèse s'attache à répondre à ces questions de façon empirique à l’aide de modèles de choix discrets. Il s’agit, dans un premier temps, d’analyser les contraintes techniques, sociodémographiques et spatiales que rencontrent les ménages et qui entravent les choix énergétiques dans le logement. Une méthodologie de détection des ménages contraints a été proposée, puis appliquée au choix du chauffage en 2006 et 2013. Dans un deuxième temps, les préférences des ménages pour les équipements de chauffage et les travaux de rénovation ont été analysées. Cette deuxième partie utilise une enquête expérimentale qui a été réalisée spécialement pour ce travail de recherche auprès de 2000 ménages. Ce travail a permis de comprendre les préférences des ménages, leur hétérogénéité, et d’en déduire les consentements à payer, les taux d’actualisation implicites et les différents effets économiques.

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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Adami, Salah-Eddine;

    Les progrès réalisés durant ces dernières années dans le domaine de la microélectronique et notamment vis-à-vis de l'augmentation exponentielle de la densité d'intégration des composants et des systèmes a participé activement à l'apparition et au développement de systèmes portables communicants de plus en plus performants et polyvalents. La R&D dans les technologies de stockage d'énergie n'a pas suivi cette tendance d'évolution très rapide ; ce qui constitue un handicap majeur dans les évolutions futures des systèmes portables. La transmission d'énergie sans fils sur des distances considérables (plusieurs dizaines de mètres) grâce aux microondes constitue une solution très prometteuse pour pallier aux problèmes d'autonomie dans le cas des systèmes sans fils communicants. De plus, du fait de l'omniprésence des ondes électromagnétiques dans notre environnement avec des niveaux plus ou moins importants, la récupération et l'exploitation de cette énergie libre est également possible. La rectenna (Rectifying Antenna) est le dispositif permettant de capter et de convertir une onde électromagnétique en une tension continue. Plusieurs travaux de thèse axés sur l'étude et l'optimisation de la rectenna ont été réalisés au sein du laboratoire. Ces travaux avaient montré que pour des faibles niveaux de champs les tensions délivrées par la rectenna sont généralement très faibles et inexploitables. Aussi, comme la majorité des micro-sources d'énergie et à cause de son impédance interne, les performances de la rectenna dépendent fortement de sa charge de sortie. Ainsi, le développement d'un système d'interfaçage de la rectenna est nécessaire afin de pallier ces manquements inhérents du convertisseur RF/DC. Ce genre de système d'interfaçage est généralement absent dans la littérature à cause des faibles niveaux de puissance exploités. Par conséquent, la rectenna est très souvent utilisée tel quelle ; ce qui limite fortement le champ applicatif. Dans ce projet de recherche, un système de gestion énergétique de la rectenna complètement autonome a été conçu, développé et optimisé afin de garantir les performances optimales de la rectenna quelques soient les fluctuations de la puissance d'entrée et celles de la charge de sortie. Le circuit d'interfaçage permet également de fournir à la charge des niveaux de tension utilisables. Le système réalisé est basé tout d'abord sur l'utilisation d'un convertisseur DC/DC résonant pouvant fonctionner d'une manière complètement autonome à partir de niveaux très bas de la tension et de la puissance de la source. Ce convertisseur permet donc de garantir l'autonomie du système en éliminant la nécessité d'une source d'énergie auxiliaire. A cause de ses faibles performances énergétiques, ce convertisseur ne sera utilisé que durant la phase de démarrage. L'efficacité du système en termes de rendement énergétique et d'adaptation d'impédance est garantie grâce à l'utilisation d'un convertisseur Flyback fonctionnant dans son régime de conduction discontinu. Ainsi, une adaptation d'impédance très efficace est réalisée entre la rectenna et la charge de sortie. Ce convertisseur principal fonctionnera durant le régime permanent. Les deux convertisseurs ont été optimisés pour des niveaux de tension et de puissance aussi bas que quelques centaines de mV et quelques μW respectivement. Des mesures expérimentales réalisées sur plusieurs prototypes ont démontré le bon fonctionnement et les excellentes performances prédites par la procédure de conception ; ce qui nous permet de valider notre approche. De plus, les performances obtenues se distinguent parfaitement vis-à-vis de l'état de l'art. Enfin, en fonction de l'application désirée, plusieurs synoptiques d'association des deux structures sont proposés. Ceci inclut également la gestion énergétique de la charge de sortie.

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    Authors: Martz, François;

    During this PhD thesis we developped two new molecular modeling methods applied to enzymes containing flavin-type prosthetic groups.The first method, PredFace, predicts the stereochemistry of products from a reaction catalyzed by enzymes containing prosthetic groups, by automatically identifying the solvent-exposed face of the prosthetic group. The protocol involves the use of eigth complexes as "probes", obtained by symmetry operations starting from the transition state of a hydrogen atom transfer reaction between nicotinamide and lumiflavin. These complexes are positioned in the binding site with the prosthetic group as reference and the energy of the protein-ligand interaction is evaluated by the scoring function implemented in the docking software (AutoDock). The most favorable interaction energy allows the identification of the prosthetic group face that is available for the enzymatic reaction in the binding site. The PredFace method has been validated by analyzing all the structures in the Protein Data Bank containing flavin-derived prosthetic groups (2170). This method is very fast (less than a minute), which allowed us to develop a web site open to the scientific community.The second method, ProsthDock, is a new mechanism-based molecular docking method guided by prosthetic groups present in the active sites of enzymes. The development of this method was motivated by the incapacity of the currently available docking methods to provide, in the presence of prosthetic groups, ligand conformations that are compatible with the enzymatic reactions. In this regard, we have added a new term to the classical scoring function, to take into account the interaction between ligand and prosthetic group. We have built a simplified model of the NADH/FMN complex and calculated the transition state of the hydrogen transfer reaction between the two partners. Potential energy surfaces have been calculated for this reaction by variating the angle, diedral angle and distance between the two reaction partners. A subsequent docking with constraints provides binding site conformations of the ligand for which the new term of the scoring function is calculated using the potential energy surfaces. This results in a new ranking of the docking poses, favoring those in agreement with the enzymatic reaction. Les travaux de cette thèse ont porté sur le développement de deux méthodes de modélisation des enzymes contenant des groupes prosthétiques de la famille des flavines.La première méthode, PredFace, permet de prédire la stéréochimie des produits d'une réaction catalysée par des enzymes contenant des groupes prosthétiques, en identifiant la face libre d'interaction avec les substrats. Le protocole mis en place pour cette méthode implique l'utilisation de huit complexes "sondes", obtenus par des opérations de symétrie à partir de l'état de transition de la réaction de transfert d'un atome d'hydrogène entre le nicotinamide et la lumiflavine. Ces complexes sont positionnés dans le site actif avec le groupe prosthétique comme référence et dans chaque cas l'énergie d'interaction protéine-ligand est évaluée par la fonction de score implémentée dans le logiciel de docking utilisé (AutoDock). L'énergie d'interaction la plus favorable permet d'identifier la face du groupe prosthétique accessible pour la réaction enzymatique dans le site actif. La méthode PredFace a été validée par l'analyse de l'ensemble des structures de la Protein Data Bank contenant des groupes prosthétiques de la famille des flavines (2170). Le protocole mis au point est très rapide (moins d'une minute), ce qui nous a permis de développer un site web afin de mettre cette méthode à la disposition de la communauté.La seconde méthode, ProsthDock, est une nouvelle méthode de docking basée sur le mécanisme d'une réaction enzymatique catalysée par un groupe prosthétique et guidée par la présence de ce groupe prosthétique dans le site actif de l'enzyme. Le développement de cette méthode a été motivé par le fait que les méthodes actuelles de docking, en présence de groupes prosthétiques, se révèlent incapables de produire des poses correctes pour des substrats, en accord avec les réactions enzymatiques. Afin de remédier à ce problème nous avons ajouté à la fonction de score classique un terme supplémentaire, qui rendra compte de l'interaction du ligand avec le groupe prosthétique. Dans un premier temps, nous avons construit un modèle simplifié du complexe NADH/FMN et calculé l'état de transition de la réaction de transfert d'hydrogène entre les deux partenaires. Des surfaces d'énergie potentielle pour cette réaction ont été calculées en variant la distance, l'angle et l'angle dièdre entre les deux réactifs. Un docking sous contrainte est ensuite réalisé et en fonction du positionnement de chaque pose de docking dans le site actif le terme supplémentaire de la fonction de score est calculé à partir des surfaces d'énergie potentielle, ce qui nous permet de modifier le classement des résultats de docking en favorisant les poses qui sont en accord avec la réaction enzymatique.

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    Authors: Félix-Faure, Jim; Chanudet, Vincent; Walter, Christian; Dorioz, Jean Marcel; +5 Authors

    Les réservoirs résultant de la construction de barrages noient de la végétation et des sols. Leur évolution suit trois phases.[br/] - Dynamique initiale : les nouvelles niches écologiques ouvertes ainsi que les stocks de carbone et de nutriments contenus dans la végétation vivante et morte contribuent à une hausse brutale du niveau trophique et de la productivité des réservoirs. Ce phénomène, appelé « trophic upsurge », est d’importance et de durée variables. Il s’accompagne d’une désoxygénation et d’émissions de CO2 et de CH4, d’autant plus fortes que la température est élevée.[br/] - Dynamique à moyen terme : le marnage induit par l’exploitant exonde temporairement les sols noyés, qui sont alors soumis à l’érosion par le batillage des vagues. Dès que la pente dépasse 5 %, les matériaux érodés sont redistribués dans la zone toujours en eau, contribuant au « trophic upsurge » et à la sédimentation. Ces phénomènes ont été très peu quantifiés. Des résultats récents obtenus sur la retenue de Sarrans (Aveyron) suggèrent que ce phénomène est à l’origine d’une proportion importante de l’accumulation sédimentaire. L’influence écologique de l’apport de nutriments associé à la redistribution des sols pourrait être significative dans les environnements oligotrophes. On connaît très mal l’évolution des sols ennoyés au fond des retenues. Des observations préliminaires effectuées sur la retenue de Sarrans montrent que les sols conservent leur structure d’origine. Elles suggèrent aussi que des sols bruns de prairie, ennoyés en permanence depuis 80 ans, ou exondés occasionnellement, ont perdu 30 % de leur carbone, par minéralisation.[br/] - Dynamique à long terme : A long terme, ce sont les sols du bassin versant et de la zone de marnage en pente faible qui influencent l’écologie des retenues. Les sols du bassin versant dans la mesure où le contexte écologique influence l’érosion et l’apport de nutriments. Les sols de la zone littorale dans la mesure où ils soutiennent une production végétale, qui peut contribuer à filtrer l’eau, mais aussi à l’alimenter en carbone organique minéralisable. Il semble que l’émission de gaz à effet de serre par les réservoirs est, toutes choses égales par ailleurs, plus importante que celle des lacs naturels, probablement en raison de la forte sédimentation, et des variations de pression qui favorisent l’émission de CH4, en particulier lors du passage en turbine. Reservoir establishment results in the submersion of soils and vegetation. Their ecological evolution follows 3 main phases.[br/] - Initial: carbon and nutrients stored in living and dead vegetation biomass supply for a rise of the trophic level and productivity of the lake. During this phase, named « trophic upsurge », which duration and intensity are variable, water anoxia, CO2 and CH4 emissions also rise especially when temperature is high.[br/] - Mean Term: Water level fluctuates according to seasonal energy needs. Waves erode submerged soils along the shoreline. If the slope is steeper than 5%, soils are redistributed downslope and this flux contributes to the trophic upsurge and to sediment accumulation. These phenomena have been poorly studied and quantified. Our measurements at Sarrans reservoir suggest that soil redistribution is a major contributor to sediment accumulation. The ecological influence of carbon and nutrient inputs to the lake may be significant in oligotrophic environments. The evolution of permanently submerged soils is poorly known. Preliminary measurements at Sarrans reservoirs show that grassland cambisols (almost) permanently submerged have lost 30% of their original carbon store since impoundment.[br/] - On the long term, both catchment soils, through erosion and nutrient supply, and soils of the littoral zone, which support vegetation communities, influence reservoir ecology. The accumulation of sedimentary carbon in reservoirs appears much higher than in natural lakes, even eutrophic, and reasons for this are many. Greenhouse gas emission is also higher, because of higher sedimentation rate and increased water level fluctuations that favour methane bubbling and water degassing at the turbine outlet.

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    Authors: Ndiaye, Aminata; Ndiaye, Paul;

    Le changement climatique exige une compréhension de son fonctionnement pour bâtir des politiques de gestion efficaces, car la variabilité climatique contemporaine a engendré des bouleversements des écosystèmes naturels et produit une désarticulation sociale. Il est donc nécessaire de revisiter certains concepts clés (dégradation, ressources naturelles, acteurs, etc.), avant d'examiner la réalité de la dégradation environnementale, au regard de facteurs peu souhaitables par rapport auxquels il faut pourtant essayer d'esquisser un futur désirable. Les dynamiques environnementales en cours génèrent, en effet, des mutations peu avantageuses et conduisent à des conflits redoutables sur l'eau, la terre et toutes les autres ressources dites naturelles. Dès lors, de nombreux défis se font jour ; ils appellent des solutions qui tiennent compte à la fois de l'illusion et du forçage du destin, car les expériences douloureuses imposent la prudence, mais les potentialités indiscutables fondent, a contrario, de réelles ambitions de sortie des situations difficiles dans lesquelles se trouve l'Afrique. Il s'agit d'un pari sur l'avenir, pour le continent, en tablant d'abord, sur une triple durabilité (institutionnelle, socio-économique et environnementale) mais aussi, sur sa capacité à s'adapter à l'adversité du changement climatique et à améliorer l'utilisation peu efficiente de ses ressources naturelles par une option claire et holistique pour les stratégies d'intégration régionale. C'est le miracle que l'Afrique se doit de faire dès à présent, et pendant ce siècle ! Mots clés : environnement, dégradation, changement climatique, ressources naturelles, acteurs.

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    Authors: Sy, Sams Dine;

    While the level of uncertainty enriched by the climate wars hypothesis, controversial moves on the finance field. Breaking with development aid and the conventional financial system, the climate financing enters a period of radical uncertainty. Data and information collected over the COP held, can lay the groundwork for a financial prospective. The study proposes socio-economic and financial scenarios inspired by the IPCC approach in assessing transformation with representative socioeconomic evolution pathways. The vision of long-term cooperative action allows to raise more funds to expand developing countries participation in the effort of data collection, development of good practice and guidelines. But reducing the time taken for adaptation and mitigation may lead to more radical solutions are needed to lower the temperature. The study proposes that Africa should adhere to the vision of development erga omnes around a futureresilient financial system. The study recommends the setting of an Inter-Governmental Panel on Climate Financing to solve the problem of the transformation of global savings in very long term investment and to periodically report on the performance of the Global Investment Fund. Africa will also integrate the global value chain of carbon finance and to structure the innovation system with "clean tech" and "green business". Finally the study recommends several initiatives to provide financial support for large scale geoengeneering through reforestation, sequestration and storage of CO2 and solar radiation management. Keywords: Africa | climate | financing| prospective | resilience| development | innovation

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    Authors: African Capacity Building Foundation;

    Le Rapport sur les Capacités en Afrique (RICA) et les indicateurs qu'il propose offrent les intrants nécessaires pour éclairer les choix en matière d'appui au renforcement des capacités. Pour la plupart des pays, l'environnement institutionnel est très propice, et les processus de mise en œuvre sont en place. Cependant, les résultats de développement ne suivent pas, et encore moins les résultats en matière de renforcement des capacités. Le rapport et ses indicateurs soulignent également les réformes institutionnelles et en matière de règlementation qui sont nécessaires pour mieux soutenir les partenariats public-privé en matière d'investissement et de renforcement des capacités, ainsi que les investissements nécessaires pour renforcer davantage l'administration publique. De même, ils soulignent l'importance de la volonté politique dans l'inclusion sociale et le développement. Chaque rapport présente un thème annuel d'une importance clé pour le programme de développement de l'Afrique. Cette année, l'accent est mis sur les exigences de capacités pour l'intégration régionale, qui font partie du mandat de l'ACBF, et sur les capacités des communautés économiques régionales (CER). Le rapport dégage les points ci-après qui sont nécessaires pour renforcer les CER : intégrer le renforcement des capacités dans l'ensemble des efforts visant à réaliser un développement durable ; assurer des ressources administratives et financières suffisantes ; mettre l'accent sur la rétention et l'utilisation des compétences, et pas seulement sur leur acquisition ; et assurer le suivi-évaluation de tous les efforts de renforcement des capacités. Dans le cadre de l'intégration régionale, la dimension capacités est essentielle de nos jours puisque les pays, les CER, les institutions régionales spécialisées et les organisations régionales de développement, sont en train de développer des cadres stratégiques régionaux et de renforcer leurs capacités en vue de poursuivre l'intégration régionale à travers le continent. Les nombreuses ...

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    Authors: Ragazzi, Graziella;

    To face the climate change, energy transition is required. Energy transition is a societal transition, which is really challenging because of its singularities. The multi-level governance is necessary in order to act now for the energy transition. Indeed States take action by negotiating international agreements for the climate on the one hand, and on the other hand by legislating their national regulatory framework. Local authorities intervene too owing to their competencies which give them a high influence power on decentralized production system and on energy consumption. The local scale plays a major role because they benefit from closed and trustful relationships which foster collective action and act as a real leverage. It is at the territories level that energy transition projects emerge and that fight against global warming become true. That's why it is necessary to understand what types of local projects for the energy transition arise, and what is their economic, social and environmental performance. This can allow public authorities to identify what are the performant projects and to encourage to replicate them on the one hand, and on the other hand to remove barriers in order to make arise innovant projects. In the long run, we must understand what kinds of projects will unfold and generalize as part of the energy transition depending on the value they will generate. To answer this, the business models perspective is highly appropriate: it constitutes an analytical framework which allows to describe the project features (its value proposition, its value configuration) and to determine its viability and sustainability according to the (economic, financial, social, environmental) values creation it builds. The thesis puts forward a typology of energy transition business models at the local scale, an analytical framework for projects adapted to the energy transition societal stake. Finally the thesis suggests some public policy recommandation in terms of assessment of the economic, social and environmental performance of the local projects for the energy transition.; Face à l'urgence dans la lutte contre le réchauffement climatique, la transition énergétique bas carbone est une transition sociétale constituant un véritable défi du fait de ses singularités. Les conditions de sa réalisation résident dans un pilotage politique multi-niveaux afin d'agir dès à présent sur les différents leviers d'action possibles. En effet les Etats interviennent d'une part lors des négociations internationales afin de parvenir à un accord universel sur le climat, et d'autre part dans la législation de leur cadre réglementaire national. Les collectivités locales interviennent également du fait de leurs compétences leur conférant un pouvoir d'influence conséquent sur les modes de production décentralisés et sur la consommation d'énergie. L'échelle locale joue un rôle de premier ordre car elle bénéficie des liens de proximités et de confiance qui favorisent l'action collective et constitue un véritable effet de levier. C'est au niveau des territoires que les projets de la transition énergétique émergent et que la lutte contre le réchauffement climatique se concrétise. C'est pourquoi il est nécessaire de comprendre quels types de projets locaux pour la transition énergétique émergent, et quelle est leur performance tant d'un point de vue économique, que social et environnemental. Cela permettra d'une part aux pouvoirs publics d'identifier les types de projets performants pour impulser leur développement, et d'autre part quels sont les freins à lever le cas échéant pour faire émerger des projets innovants. Sur le long-terme, il s'agit de comprendre quels types de projets se déploieront et se généraliseront dans le cadre de la transition énergétique en fonction du type de valeur qu'ils parviendront à générer. Pour répondre à cela, l'approche des business models est pertinente : elle constitue en effet une grille d'analyse permettant de déterminer les caractéristiques de chaque projet, en décrivant sa proposition de valeur et la configuration de cette valeur, et de déterminer sa viabilité et sa durabilité en fonction de la création (ou destruction) de valeurs (économique, financière, sociale, environnementale) qu'il génère. La thèse propose ainsi une typologie des business models de la transition énergétique à l'échelle locale, une grille d'analyse de projet adaptée à l'enjeu sociétal que représente la transition énergétique et propose enfin des recommandations pour la politique publique en matière d'évaluation de la performance économique, sociale et environnementale de projets locaux de transition énergétique.

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    Authors: Plénet, Daniel; Jeannequin, Benoit; Chauvin, Jean-Eric;

    National audience; The fruit, vegetable and potato (FLP) sectors are characterised by a high structural diversity linked to the many species and varieties cultivated and to very varied production and marketing structures. The very strong competition imposed by the long distribution and import-export channels has gradually led, for reasons of economic rationality, to a specialisation of the production basins and part of the farms with standardisation of production means and products, but also the disappearance of many small farms. Overall, these changes have resulted in an erosion of surfaces and a decrease in the volumes produced for the majority of sectors with the exception of potatoes and certain nuts. Nevertheless, the dynamism of certain "product" sectors has led to a revival of competitiveness and/or a better Plénet D. et al. 80 Innovations Agronomiques 68 (2018), 79-105 development of the offer thanks to approaches relating to the development of high-tech systems, the reduction in the use of synthetic products, segmentation and commercial differentiation, and the creation of quality signs. In addition, the renewal of short and local circuits has recently made it possible to develop a very diversified network of farms in all regions. The emergence of high expectations for organic farming products and for healthy and sustainable agro-food systems offers new opportunities today. To benefit from them, the FLP sectors will have to develop coherent strategies to strengthen complementarities and synergies between different production, processing and marketing systems. These diversity enhancement strategies will contribute to increasing the economic and environmentalrobustness of the FLP sectors.; Les filières fruits, légumes et pomme de terre (FLP) se caractérisent par une diversité structurelle importante liée aux nombreuses espèces et variétés cultivées et à des structures de production et de commercialisation très variées. La très forte concurrence imposée par les circuits longs de la grande distribution et de l’import-export a progressivement entrainé pour des raisons de rationalité économique une spécialisation des bassins de production et d’une partie des exploitations avec une standardisation des moyens de production et des produits, mais aussi la disparition de nombreuses petites exploitations. Globalement, ces évolutions se sont traduites par une érosion des surfaces et une diminution des volumes produits pour la majorité des filières à l’exception de la pomme de terre et de certains fruits à coque. Néanmoins, le dynamisme de certaines filières « produit » a entrainé un regain de compétitivité et/ou une meilleure valorisation de l’offre grâce à des démarches portant sur le développement de systèmes à haute technicité, la réduction d’utilisation des produits de synthèse, la segmentation et la différenciation commerciale, et la création de signes de qualité. Par ailleurs, le renouveau des circuits courts et de proximité permet depuis peu de développer dans toutes les régions un tissu d’exploitations très diversifiées. L’émergence d’une forte attente pour les produits de l’agriculture biologique et pour des systèmes agro-alimentaires sains et durables offre aujourd’hui de nouvelles opportunités. Pour en bénéficier, les filières FLP devront élaborer des stratégies cohérentes afin de renforcer les complémentarités et les synergies entre différents systèmes de production, de transformation et de commercialisation. Ces stratégies de valorisation de la diversité contribueront à accroitre la robustesse économique et environnementale des filières FLP.

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