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Environmental tax and subsidy are two key instruments used in many countries to prevent environmental degradation and to achieve sustainable development. Using game theoretic approach, this paper develops and calibrates a model to determine optimum indirect environmental tax for Iran. More specifically, in the first stage the government sets green taxes and subsides, and in the second stage, the final goods and energy producing firms take these rates and choose their inputs. This dynamic game is solved by backward induction. Prior to our calibration, the production functions for fossil energy, renewable energy - as an intermediate goods - and final goods are estimated. The model is calibrated by using the Iranian data for the period 2015. The results indicate that the optimum green tax rate on fossil energy producing firm and final goods firm are 18 and 9 percent, respectively. These results have important policy implications for policymakers and social planners in Iran.

A large portion of the world energy consumption is provided by fossil fuels, which cause massive emissions of dangerous pollutants into the environment leading to global warming and climate change. What is certain is the world's energy consumption in order to increase economic growth and the resulting greenhouse gas emissions, especially carbon dioxide, the consumption of fossil fuels is a growing trend. Therefore in the present study to examine the causal relationship between CO2 emissions (as an alternative to the destruction of the environment variable) and variables of FDI, per capita energy consumption and GDP in the form of an environmental Kuznets hypothesis in Iran during 1980-2008. To that end, The Toda-Yamamoto method, has been used to examine the causality relationship. The main finding of this study shows that there exists bidirectional causality between CO2 emissions and energy consumption and unidirectional causality running from GDP to CO2 emissions. Given the existence of causal relationships between variables, the hypothesis of environmental Kuznets curve (EKC) in state variables that criterion economic growth CO2 emissions and energy consumption is to be confirmed, but in that case the criterion of economic growth, GDP is confirmed is not.

Expansion of foreign trade has important effects on energy intensity based on the structural conditions and economic nature of countries. In the present research the scale effect (the economy volume changing), the composite effect (the structure of economic activities changing) and the technical effect (productivity changing) resulting from the trade on the energy intensity of Iran economy, as one of the important economic-environmental indicators is investigated. For this purpose the empirical model of the research according to the economic theories by using the structural vector autoregression in 1353-1392 is modeled. The results of the model show that the trade expansion have positive scale and composite effects but negative technical effect on the energy intensity of Iran. Also the size of technical effect is bigger than the resultant of the two other effects. Therefore according to the results, increasing the volume of foreign trade has not energy intensive effect and there is evidence that energy intensity decreases from the total factors productivity channel (as an indicator of technical changes). Therefore the expansion of foreign trade in Iran is considered energy saving.

This study was conducted to determine growth parameters, catch and fishing effort trends, stock assessment of Caspian Sea mullets in the Iranian coastal waters of Caspian Sea in the fishing season of 2013-2014. For gathering of data on biometry and catch statistics, 5 mobile working group in the regions of Anzali, Kiashahr, Noshahr, Babolsar and Torkmen were involved from the start to the end of fishing season.Gathered data Were entered to the computer. For data analysis, common methods were undertaken for estimation of growth parameters, mortality rates, biomass and Maximum Sustainable yield (MSY) as well. According to the result, the number of beach seines cooperatives was 124 and fishing efforts were 44688 beach seining haul. The catch per unit of effort CPUE) was calculated 53 kg/haul during this fishing season. The total catches of Caspian Sea mullets (including illegal fishing estimated as 2373 mt. Growth parameters of golden gray mullet (Liza aurata) were estimated as K=0.16/yr, L_∞=57.4 cm, t_0=-0.45/yr. Based on catch-at-age data, in the fishing season of 2013-2014, the total biomass, from the biomass-based cohort analysis were estimated 12473.3. mt. Based on these results, the fishing mortality rate in fishing season of 2013-2014 were 0.575/yr. In this survey, the Maximum sustainable yield were estimated as 2558.6 mt respectively. Generally from three Northern Province’s cooperatives 3406 samples collected. Results of biometry of golden gray mullet (Liza auratus) showed that the mean length and weight and age of this species were 32.3±6.1 cm and 383.5±74.823.4 g and 1.2±5.6 y respectively and leaping gray mullet (Liza saliens) showed that the mean length and weight and age of this species were 24.8±3.3 cm and 119±25.5 g and 2.5±0.6 y respectively. The biometric results showed that, 97.5% of the samples belonged to golden gray mullet and population of leaping gray mullet was sever declined. Also, the fishing of the mullet was increased over the last year by 10.3 % from 2151 tons to 2373 tons per year during 1391-92 and 1392-93, respectively .

Energy, one of the most essential and important factors of production and the final product, has an important role in the growth and economic development. This research examines the dynamic relationship between financial development and energy consumption based on GMM estimation in 53 developing countries and 47 advanced countries over the period 2000-2014. The results showed the positive impact of direct foreign investment and national income on energy consumption in the two groups of countries. Energy prices had a completely opposite effect on energy consumption in developing and advanced countries. The results also indicated that in both developed and advanced countries the money market plays a more effective role in reducing energy consumption in comparison with the capital markets. While the effect of financial development through the money market on energy consumption is U- inverse shape in both groups of countries, this effect through the capital market is U-shape and U-shape inverse for developing countries and advanced countries, respectively. These results might have important policy implications for energy management policymakers and authorities to achieve sustainable development in different countries.

Introduction: Safety in construction needs not only operating the executive laws and instructions but also the safety culture of all the workers in workshops. Safety culture is a factor by which all the workers are committed to having a positive share in the safety of their coworkers and themselves. Therefore, the aim of this study is identification of safety culture factors and ranking occupations in jobsites in order to improve the safety condition and promote the safety culture of high-rise projects. Material and Method: In this descriptive-analytical study, first, safety culture criteria in construction projects are identified by a literature review. Then, 8 factors of safety culture are weighted using fuzzy analytic hierarchy process. Finally, 10 different occupations in high-rise workshops are ranked from the point of view of safety culture using fuzzy TOPSIS method. Result: Results of ranking the criteria show that the most important criteria are safety attitude, supervision, policy of organization and safety training. Moreover, in high-rise construction the site superintendent and supervisor occupations have the highest and laborers have the lowest safety culture. Conclusion: In this study, after evaluating different construction occupations by hybrid FTOPSIS-FAHP method, the results are compared with the results of previous researches. Here, it was found that the findings are consistent with previous studies. On the other hand, low level of safety culture of construction laborers among the investigated occupations shows weakness in safety training and attitude; hence, the factors such as more safety supervision and training must be considered in order to create a positive safety culture for the workers.

Scrutiny of energy consumption behavioural patterns in various economic sectors represent an essential step in energy consumption planning and management. Delineation of determinants of energy demand is highly significant in Iran which is a country with rich energy resources, abundant oil and gas supplies, heavy minerals and potential resources. Therefore, using Panel Data Methods, this study explored the effects of urbanization and human capital on energy consumption in Iranian agriculture, industry and services sectors over a 17-year period between 1996 and 2016. The results showed that human capital, workforce productivity, interactive effect of human capital on workforce productivity and the squared value of economic sectors had negative effects while the added value had positive impacts on energy consumption during the specified period. The results of the analyses indicated that human capital and workforce productivity in economic sectors had negative significant interactive effects on energy consumption at the critical value of .01 implying that an increase in human capital and corresponding workforce enhancement will facilitate economizing on energy consumption. Moreover, the estimated coefficients of added value and squared added value of economic activities revealed an inverse U-shaped relationship between added values of economic sectors and energy consumption.

"n "nBackground and Objectives: Experiments were conducted to investigate the behavior of Moving Bed Biofilm Reactor (MBBR) as a novel aerobic process for treatment of aniline synthetic wastewater as a hard biodegradable compound is commonly used in number of industrial processes. The objective of this paper is evaluation of MBBR in different conditions for treatment of aniline and determination of reaction kinetics."nMaterials and Methods: In the MBBRs, different carriers are used to maximize the active biofilm surface area in the reactors. In this study, the reactor was filled with Light Expanded Clay Aggregate (LECA) as carriers. Evaluation of the reactor efficiency was done at different retention time of 8, 24, 48 and 72 hours with an influent COD from 100 to 3500 mg/L (filling ratio of 50%). After obtaining removal efficiencies, effluent concentration of aniline was measured by adsorption spectrum and maladaptive municipal wastewater treatment plant sludge in batch conditions for confidence of aniline biodegradation and its adsorption to the sludge mass. "nResults:The maximum obtained removal efficiencies were 91% (influent COD=2000 mg/L) after 72 hours. Biodegradation of aniline in MBBR has been also approved by NMR spectrum tests. Finally experimental data has indicated that Grau second order model and Stover-Kincannon were the best models to describe substrate loading removal rate for aniline."nConclusion:biological treatment of aniline wastewater compared to other researchers methods.

Background and Objective: Study was conducted to evaluate the sustainability of the two autumn and spring potato (Solanum tuberosum L.) farming ecosystems. Methods and Materials: The study was conducted by questionnaire in Golestan Province during the period of 2017-2018. 120 autumn farms and 60 spring farms were selected by stratified random sampling method. After determining inputs and output and their energy equivalent, the energy indices were determined. Results: Fossil fuels and fertilizers were the largest energy inputs of the total in autumn and spring potato farming ecosystems with share of 30.26% and 29.04%, respectively. In autumn and spring potato farming ecosystems, energy use efficiency indices were 1.85 and 1.30; energy productivity indices were 0.51 and 0.36 kg MJ-1; specific energy indices were 1.95 and 2.76 MJ kg-1; net energy indices were 52135.16 and 16125.42 MJ ha-1; mechanization indices were 0.96 and 0.94; total energy inputs were 61384.83 and 53234.59 MJ ha-1 and total energy outputs were 113519.99 and 69360.01 MJ ha-1, respectively. Conclusion: The efficiency and the sustainability of the autumn farming ecosystem were higher than the spring in terms of potato production in Golestan Province. In autumn and spring farming ecosystems, the share of indirect, nonrenewable and commercial energy were greater than that of direct, renewable and noncommercial energy. It is useful to implement recommended guidelines for optimal management of inputs such as conservation tillage, modernization of machinery and consumption of manure, it reduces the share of nonrenewable and commercial energy and increases environmental health and energy efficiency.

Background and Objectives: The continuous increase in solid waste generation worldwide due to population growth and industrialization, calls for management strategies that integrate concerns for environmental sustainability. By quantifying environmental impacts of systems, Life Cycle Assessment (LCA) is a tool which can contribute to answering that call. The aim of this study was to evaluate environmental pollutants resulting from various treatment options including anaerobic digestion, incineration, and landfill of Municipal Solid Waste (MSW) generated daily in Tehran. Materials and Methods: First, the physical properties of the waste and consumption of inputs in the study area were determined from September to October, 2014- 2015. Then the different steps of LCA in relation to each of the subsystems were followed (with SimaPro software). Finally, the results based on the CML Baseline 2000 were presented and analyzed. Results: It was found that when the higher rate of separation and processing in any subsystems increases, the emission of environmental pollutants decreases, so that the global warming potential, acidification, eutrophication, and abiotic depletion as the most important impact categories in the subsystems of anaerobic digestion were obtained as -125935 kg CO2/day, -449 kg SO2/day, -1690 kg PO43-/day and -0.43 kg Sb/day, respectively and in incineration were obtained as -264872 kg CO2/day, -974 kg SO2/day, -3471 kg PO43-/day and -0.76 kg Sb/day, respectively, while in the landfill subsystem, they were estimated to be 74478 kg CO2/day, 362 kg SO2/day, 118 kg PO43-/day, and 0.13 kg Sb/day, respectively. Conclusion: According to the constituent processes of each of the subsystems and the results of the evaluation of exhaust emissions subsystems, it can be concluded that in an integrated system of waste management, the energy-generating systems such as anaerobic digestion and incineration should be as the first priority and the traditional subsystems such as landfill should be as the last priority.