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Abstract As the negative repercussions of environmental devastation, such as global warming and climate change, become more apparent, environmental consciousness is growing across the world, forcing nations to take steps to mitigate the damage. Thus, the current study assesses the effect of green investments, institutional quality, and political stability on air quality in the G-20 countries for the period 2004–2020. The stationarity of the variables was examined with the Pesaran (2007) CADF, the long-term relationship between the variables by Westerlund (2007), the long-run relationship coefficients with the MMQR method proposed by Machado & Silva (2019), and the causality relationship between the variables by Dumitrescu & Hurlin (2012) panel causality. The study findings revealed that green finance investments, institutional quality and political stability increased the air quality, while total output and energy consumption decreased air quality. The panel causality reveals a unidirectional causality from green finance investments, total output, energy consumption and political stability to air quality, and a bidirectional causality between institutional quality and air quality. According to these findings, it has been found that in the long term, green finance investments, total output, energy consumption, political stability, and institutional quality affect air quality. Based on these results, policies implications were proposed.

The transition of most economies especially heavily industrialized nations like China, Turkey, Russia, India, Indonesia, Brazil, and Mexico fondly known as E7 are fast emerging economies with its impact on economic growth and ecosystem. On the above highlight, the present study explores the dynamic interaction between hydroelectricity energy, renewable energy consumption, nonrenewable energy consumption on economic growth over annual time frequency data from 1990 to 2018. To this end, Kao co-integration technique is adopted in conjunction with panel ordinary least squares, dynamic ordinary least squares, and fully modified ordinary least square estimators over the identified blocs while the heterogeneous causality test of Dumitrescu and Hurlin is employed to detect the direction of causality among the variables. Empirical result shows long-run analysis reveals long-run equilibrium relationship between the examined variables. Furthermore, a one-way causality relationship is observed between economic growth and nonrenewable energy, economic growth and renewable energy, and economic growth and pollutant emission. The present study identifies a U-shaped pattern among nonrenewable energy consumption and economic growth in the long-run. These findings suggest that as economic growth increases, there is less strengthening of energy from the nonrenewable energy consumption hence, portentous deterioration in nonrenewable usage while authenticating the proficiency of nonrenewable energy consumption in the E7 countries. Further policy prescriptions are rendered in the concluding section.

South Africa is one of Africa's most polluted countries, with rising CO2 emissions posing a threat. South Africa must discover ways of minimizing pollution and take necessary steps before it is too late in order to achieve sustainable growth. For this purpose, this research assesses the ecological consequences of globalization, nonrenewable energy use, economic growth and renewable energy consumption in South Africa. The study leverages on the non-linearity advantages of the novel quantile on quantile regression (QQR) method for a robust analysis as opposed to the use of conventional linear approaches, thereby overcoming conspicuous shortfalls in extant studies, while offering a detailed explanation of the overall dependency structure between CO2 emissions and globalization, nonrenewable energy use and renewable energy use using a dataset covering the period between 1970 and 2018. The outcomes suggest that nonrenewable energy use, globalization, and economic growth contribute to environmental degradation in the majority of the quantiles, while the effect of renewable energy use on CO2 is not strong at all quantiles. The study highlights that economic expansion, nonrenewable energy use and globalization play key roles in in mitigating environmental sustainability in South Africa, while renewable energy is not sufficient to meet environmental requirements.

Reconnaissant les conséquences dévastatrices de la détérioration de l'environnement, les membres méditerranéens se sont engagés à adopter les plans d'action du traité de 2015 de l'Accord de Paris sur le climat (COP21) alors que les émissions de dioxyde de carbone (CO2) augmentent dans la région méditerranéenne, ce qui semble être un grave défi pour l'environnement mondial. À cette fin, notre étude a examiné l'impact des investissements directs étrangers (IDE) sur la dégradation de l'environnement des membres méditerranéens pour la période allant de 1995 à 2016. Cependant, des variables telles que le développement financier, la croissance économique, les énergies renouvelables et les combustibles fossiles ont été examinées plus en détail par la méthodologie de retard réparti auto-régressif groupé par panneaux transversaux, le groupe à moyenne augmentée (AMG) et le test de causalité par panneaux Dumitrescu et Hurlin ont été utilisés pour l'analyse de causalité. Les résultats de la co-intégration de Westerlund (2007) montrent une relation d'équilibre à long terme entre les variables mises en évidence. Le résultat empirique a révélé une relation négative entre les IDE et l'hypothèse Hallo du polluant indicateur de CO2 (PHH). De plus, le revenu et son carré montrent une courbe en forme de U inversé indiquant l'hypothèse de la courbe de Kuznets environnementale (EKC). Tant le développement financier que les énergies renouvelables ont indiqué une association négative avec les émissions de CO2, tandis que les combustibles fossiles avaient une relation positive avec les émissions. Cependant, il y avait une causalité de rétroaction entre le revenu et les émissions de carbone ainsi que le développement financier et les émissions de carbone. En outre, nous observons que les IDE et les émissions de carbone, les énergies renouvelables et les émissions de carbone, ainsi que les émissions de combustibles fossiles et de carbone ont une relation de causalité unidirectionnelle. Dans l'ensemble, l'étude suggère certaines prescriptions politiques, notamment la mise en œuvre d'initiatives de conservation et la mise en place d'une réglementation et de stratégies en matière d'énergie propre pour le bloc étudié. Reconociendo las devastadoras consecuencias del deterioro ambiental, los miembros mediterráneos se comprometen a adoptar los planes de acción del tratado de 2015 del Acuerdo Climático de París (COP21), ya que las emisiones de dióxido de carbono (CO2) están aumentando en la región mediterránea, lo que parece ser un grave desafío para el medio ambiente de nuestro mundo. Con este fin, nuestro estudio examinó el impacto de la Inversión Extranjera Directa (IED) en la degradación ambiental de los miembros mediterráneos durante el período comprendido entre 1995 y 2016. Sin embargo, variables como el desarrollo financiero, el crecimiento económico, las energías renovables y los combustibles fósiles se examinaron más a fondo mediante la metodología de retardo distribuido autorregresivo agrupado de panel transversal de uso, el Grupo de media aumentada (AMG) y la prueba de causalidad de panel de Dumitrescu y Hurlin para el análisis de causalidad. Los resultados de la cointegración de Westerlund (2007) muestran una relación de equilibrio a largo plazo entre las variables resaltadas. El resultado empírico reveló una relación negativa entre la IED y el CO2, lo que indica la hipótesis del hallo contaminante (PHH). Además, el ingreso y su cuadrado muestran una curva en forma de U invertida que indica la hipótesis de la curva de Kuznets ambiental (EKC). Tanto el desarrollo financiero como las energías renovables indicaron una asociación adversa con las emisiones de CO2, mientras que los combustibles fósiles tuvieron una relación positiva con las emisiones. Sin embargo, hubo una causalidad de retroalimentación entre los ingresos y las emisiones de carbono, así como el desarrollo financiero y las emisiones de carbono. Además, observamos que la IED y las emisiones de carbono, las energías renovables y las emisiones de carbono, así como los combustibles fósiles y las emisiones de carbono, tenían una relación causal unidireccional. En general, el estudio sugiere algunas prescripciones de políticas, incluida la implementación de iniciativas de conservación y el establecimiento de regulaciones y estrategias de energía limpia para el bloque investigado. In acknowledgment of the devastating consequences of environmental deterioration, the Mediterranean members are committed to adopt the 2015 treaty action plans of the Paris Climate Agreement (COP21) as carbon dioxide emission (CO2) are on the rise in the Mediterranean region, which seems to be a serious challenge to our world's environment. To this end, our study examined the impact of Foreign Direct Investment (FDI) on environmental degradation for the Mediterranean members for the period between 1995 to 2016. However, variables such as, financial development, economic growth, renewable energy and fossil fuel were further examined by the use cross-sectional-Panel pooled Auto Regressive Distributed Lag methodology, Augmented Mean Group (AMG) and Dumitrescu and Hurlin panel causality test was used for causality analysis. The co-integration results from Westerlund (2007) shows a long-run equilibrium relationship between highlighted variables. The empirical result revealed a negative relation between FDI and CO2 indicating pollutant Hallo Hypothesis (PHH). Moreover, income and its square show an inverted U-Shaped curve indicating environmental Kuznets curve (EKC) hypothesis. Both financial development and renewable energy indicated an adverse association with CO2 emission whereas fossil fuel had a positive relationship with emissions. However, there was a feedback causality among income and carbon emission as well as financial development and carbon emission. Furthermore, we observe that FDI and carbon emission, renewable energy and carbon emission, as well as fossil fuel and carbon emission were found to have one-way causal relationship. Overall, the study suggests some policy prescriptions including the implementation of conservation initiatives and the establishment of clean energy regulation and strategies for the investigated bloc. اعترافاً بالعواقب المدمرة للتدهور البيئي، يلتزم أعضاء البحر الأبيض المتوسط باعتماد خطط عمل اتفاقية باريس للمناخ لعام 2015 (COP21) مع ارتفاع انبعاثات ثاني أكسيد الكربون (CO2) في منطقة البحر الأبيض المتوسط، والتي يبدو أنها تشكل تحدياً خطيراً لبيئة عالمنا. ولتحقيق هذه الغاية، درست دراستنا تأثير الاستثمار الأجنبي المباشر على التدهور البيئي لأعضاء منطقة البحر الأبيض المتوسط للفترة من 1995 إلى 2016. ومع ذلك، تم فحص متغيرات مثل التنمية المالية والنمو الاقتصادي والطاقة المتجددة والوقود الأحفوري بشكل أكبر من خلال استخدام منهجية التأخر الموزع الانحداري التلقائي المجمعة باللوحة المقطعية، وتم استخدام مجموعة المتوسط المعزز (AMG) واختبار سببية لوحة دوميتريسكو وهيرلين لتحليل السببية. تُظهر نتائج التكامل المشترك من ويسترلوند (2007) علاقة توازن طويلة المدى بين المتغيرات البارزة. كشفت النتيجة التجريبية عن وجود علاقة سلبية بين الاستثمار الأجنبي المباشر وثاني أكسيد الكربون مما يشير إلى فرضية هالو الملوثة (PHH). علاوة على ذلك، يُظهر الدخل ومربعه منحنى مقلوب على شكل حرف U يشير إلى فرضية منحنى كوزنتس البيئي (EKC). وأشار كل من التطور المالي والطاقة المتجددة إلى وجود ارتباط سلبي بانبعاثات ثاني أكسيد الكربون في حين أن الوقود الأحفوري له علاقة إيجابية بالانبعاثات. ومع ذلك، كانت هناك علاقة ارتجاعية بين الدخل وانبعاثات الكربون وكذلك التنمية المالية وانبعاثات الكربون. علاوة على ذلك، نلاحظ أن الاستثمار الأجنبي المباشر وانبعاثات الكربون والطاقة المتجددة وانبعاثات الكربون، وكذلك الوقود الأحفوري وانبعاثات الكربون، لها علاقة سببية أحادية الاتجاه. بشكل عام، تقترح الدراسة بعض الوصفات السياسية بما في ذلك تنفيذ مبادرات الحفظ ووضع لوائح واستراتيجيات للطاقة النظيفة للكتلة التي تم التحقيق فيها.

Abstract This study explores the applicability of conventional environmental Kuznets curve (EKC) with an extension for the case of emerging industrialized economies, comprised of China, India, Brazil, Mexico, Russia, Indonesia, and Turkey, for annual time frequency from 1995 to 2016. This study is distinct from that already documented in the extant literature by extending the traditional EKC phenomenon by accounting for the combined impact of institutional quality and renewables in E7 blocs. The countries under review are known to be emerging and still at their scale stage of their growth path. As such, the need to explore the theme is pertinent for stakeholders. Empirical framework is built on second-generational panel econometrics strategies that consist of Augmented Mean Group, Common Correlated Effects Mean Group estimator, Driscoll-Kraay and Dumitrescu and Hurlin Causality analysis, which is superior to first-generation methods. Our study validates the EKC phenomenon in E7, i.e., where emphasis is placed on economic expansion relative to the quality of the environment. The EKC phenomenon is validated by the deteriorating effect of fossil-fuel energy consumption in the bloc. However, renewables are seen as a panacea to reduce pollution emission as renewable energy exerts a negative and statistical relationship with CO2 emission over the sampled period. Additional results show that weak institution also dampens the quality of the environment in E7. These outcomes are suggestive to policy makers to reinforce their commitment to the quality of the environment in terms of growth and energy transition from fossil fuel to clean energy sources. Further policy prescriptions are presented in the concluding section.

This paper aims to investigate coal consumption and environmental sustainability in South Africa by examining the role of financial development and globalization by using a dataset covering the period from 1980 to 2017. The study utilized the Auto-regressive Distributed Lag Model (ARDL) approach in addition to the Bayer and Hank combined co-integration, fully modified Ordinary least squares (FMOLS), and Dynamic ordinary least Squares (DOLS). The study further utilized the frequency domain causality test to capture the causal linkage between the series. The advantage of the frequency domain causality is that it can capture causal linkages between series at different periods. The Bayer and Hanck co-integration and ARDL bounds tests reveal co-integration among the series. The empirical findings based on the ARDL long-run estimation reveal that a 1% increase in coal consumption increases environmental degradation by 1.077%, while a 1% increase in financial development decreases the environmental degradation by 0.973%. Furthermore, a 1% increase in economic growth decreases environmental quality by 1.449%. The outcomes of the FMOLS and DOLS approaches also provide supportive evidence for the ARDL long-run results. Furthermore, the results of the frequency domain causality test reveal that at a significance level of 1%, coal consumption Granger causes CO2 emissions at different frequencies, while financial development Granger causes CO2 emissions in the long run and short run at a significance level of 10%. In terms of policy suggestions, South Africa should embrace policies that encourage energy consumers to shift toward renewable energy. Furthermore, financial reforms should be implemented to curb environmental degradation

La dégradation de l'environnement résultant de la combustion de sources d'énergie conventionnelles est non seulement un facteur majeur du changement climatique, mais elle a également un impact négatif sur la santé humaine. Sans aucun doute, les combustibles fossiles sont des moteurs majeurs de la croissance économique ; cependant, leurs impacts environnementaux néfastes sont une préoccupation mondiale. Dans la littérature, il n'existe aucune preuve empirique complète sur le lien entre l'utilisation de différentes sources d'énergie et les émissions de dioxyde de carbone dans le contexte de la Russie, un pays classé troisième dans la liste des principaux pays émetteurs de dioxyde de carbone. Par conséquent, cet article vise à examiner les relations entre la consommation de pétrole, la consommation de gaz naturel, la consommation de charbon et les émissions de dioxyde de carbone contrôlant la croissance économique de la Russie au cours de la période 1990-2016. Les résultats de l'analyse économétrique indiquent que les émissions de dioxyde de carbone en Russie sont associées à long terme à la croissance économique et à la consommation de pétrole, de gaz et de charbon. Les estimations de l'élasticité à long terme révèlent que la croissance économique ne nuit pas directement à la qualité de l'environnement de la Russie. Cependant, l'augmentation de la consommation de pétrole, de gaz et de charbon dégrade la qualité de l'environnement en augmentant le niveau des émissions de dioxyde de carbone en Russie. De plus, les résultats de l'analyse de causalité de Granger confirment l'existence de liens de causalité à long et à court terme entre les variables préoccupantes. Conformément à ces conclusions, plusieurs recommandations politiques visant à relever les défis environnementaux en Russie sont présentées. La degradación ambiental derivada de la combustión de fuentes de energía convencionales no solo es un factor importante detrás del cambio climático, sino que también tiene un impacto adverso en la salud humana. Sin lugar a dudas, los combustibles fósiles son los principales impulsores del crecimiento económico; sin embargo, sus impactos ambientales perjudiciales son motivo de preocupación mundial. En la literatura, no hay evidencia empírica exhaustiva sobre la relación entre el uso de diferentes fuentes de energía y las emisiones de dióxido de carbono en el contexto de Rusia, una nación que ocupa el tercer lugar en la lista de los principales países emisores de dióxido de carbono a nivel mundial. Por lo tanto, este documento tiene como objetivo examinar las relaciones entre el consumo de petróleo, el consumo de gas natural, el consumo de carbón y las emisiones de dióxido de carbono que controlan el crecimiento económico de Rusia durante el período 1990-2016. Los hallazgos del análisis econométrico indican que las emisiones de dióxido de carbono en Rusia tienen asociaciones a largo plazo con el crecimiento económico y el consumo de petróleo, gas y carbón. Las estimaciones de elasticidad a largo plazo revelan que el crecimiento económico no está perjudicando directamente la calidad ambiental de Rusia. Sin embargo, un mayor consumo de petróleo, gas y carbón degrada la calidad ambiental al aumentar el nivel de emisiones de dióxido de carbono en Rusia. Además, los resultados del análisis de causalidad de Granger confirman la existencia de conexiones causales tanto a largo como a corto plazo entre las variables de preocupación. En línea con estos hallazgos, se presentan varias recomendaciones de políticas para abordar los desafíos ambientales en Rusia. Environmental degradation stemming from the combustion of conventional energy sources is not only a major factor behind climate change but it also poses an adverse impact on human health. Undoubtedly, fossil fuels are major drivers of economic growth; however, their detrimental environmental impacts are of global concern. In the literature, there is no comprehensive empirical evidence on the linkage between the use of different energy sources and carbon dioxide emissions in the context of Russia, a nation that is ranked third in the list of the top carbon dioxide-emitting global countries. Hence, this paper aims to scrutinize the relationships between oil consumption, natural gas consumption, coal consumption, and carbon dioxide emissions controlling economic growth for Russia over the 1990-2016 period. The findings from the econometric analysis indicate that carbon dioxide emissions in Russia have long-run associations with economic growth and consumption of oil, gas, and coal. The long-run elasticity estimates reveal that economic growth is not directly harming Russia's environmental quality. However, higher oil, gas, and coal consumption degrades environmental quality by boosting the level of carbon dioxide emissions in Russia. In addition, the results from the Granger causality analysis confirm the existence of both long and short-term causal connections among the variables of concern. In line with these findings, several policy recommendations to address the environmental challenges in Russia are put forward. التدهور البيئي الناجم عن احتراق مصادر الطاقة التقليدية ليس فقط عاملاً رئيسياً وراء تغير المناخ ولكنه يشكل أيضاً تأثيراً سلبياً على صحة الإنسان. مما لا شك فيه أن الوقود الأحفوري هو المحرك الرئيسي للنمو الاقتصادي ؛ ومع ذلك، فإن آثاره البيئية الضارة تشكل مصدر قلق عالمي. في الأدبيات، لا يوجد دليل تجريبي شامل على الصلة بين استخدام مصادر الطاقة المختلفة وانبعاثات ثاني أكسيد الكربون في سياق روسيا، وهي دولة تحتل المرتبة الثالثة في قائمة أكبر البلدان العالمية التي تصدر انبعاثات ثاني أكسيد الكربون. وبالتالي، تهدف هذه الورقة إلى التدقيق في العلاقات بين استهلاك النفط واستهلاك الغاز الطبيعي واستهلاك الفحم وانبعاثات ثاني أكسيد الكربون التي تتحكم في النمو الاقتصادي لروسيا خلال الفترة 1990-2016. تشير النتائج المستخلصة من التحليل الاقتصادي القياسي إلى أن انبعاثات ثاني أكسيد الكربون في روسيا لها ارتباطات طويلة الأجل بالنمو الاقتصادي واستهلاك النفط والغاز والفحم. تكشف تقديرات المرونة على المدى الطويل أن النمو الاقتصادي لا يضر بشكل مباشر بجودة البيئة في روسيا. ومع ذلك، يؤدي ارتفاع استهلاك النفط والغاز والفحم إلى تدهور الجودة البيئية من خلال زيادة مستوى انبعاثات ثاني أكسيد الكربون في روسيا. بالإضافة إلى ذلك، تؤكد نتائج تحليل سببية جرانجر وجود روابط سببية طويلة وقصيرة الأجل بين المتغيرات المثيرة للقلق. وتماشياً مع هذه النتائج، تم تقديم العديد من التوصيات المتعلقة بالسياسات للتصدي للتحديات البيئية في روسيا.

The logistics sector plays an imperative role in the economic development of a country. However, it can also affect environmental quality as it the viewed as a major energy-consuming sector. The current literature on the relationship between logistics performance and environmental quality is scant and most studies neglect its environmental impact in the context of emerging countries. In this context, this study investigates the impact of logistics performance index (LPI), green innovation, renewable energy, and economic globalization on the environmental quality in the 22 emerging countries. Using the panel data from 2007 to 2018, we employed the Method of Moments Quantile Regression (MM-QR) for empirical analysis. The empirical results show that LPI deteriorates the environmental quality by increasing CO2 emissions across all quantiles (10th–90th). Moreover, green innovation is significantly and negatively related to CO2 emission in all the quantiles except at the 10th quantiles, while renewable energy use significantly improves the environmental quality across all quantiles (10th–90th). Economic globalization shows a significant and negative impact on CO2 emission across quantiles (10th–90th) in emerging countries. Based on these findings, this study proposes that emerging countries need to align their logistics sector policies with sustainable development goals. At the same time, more resources should be allocated for green innovation and the renewable energy sector and promote economic globalization to foster sustainable development.