key: cord-0733825-52cwccjm
authors: Rasoulinezhad, Ehsan; Taghizadeh-Hesary, Farhad
title: Role of green finance in improving energy efficiency and renewable energy development
date: 2022-02-11
journal: Energy Effic
DOI: 10.1007/s12053-022-10021-4
sha: 1d50d027bc405b5c2afba429012672f6a379b11e
doc_id: 733825
cord_uid: 52cwccjm

Deploying green energy is, directly and indirectly, related to energy- and environment-related sustainable development goals (SDGs). This study uses the stochastic impact by regression on the population, affluence, and technology (STIRPAT) model to examine the relationship between CO(2) emissions, energy efficiency, green energy index (GEI), and green finance in the top ten economies that support green finance. The results show that green bonds are a suitable method to promote green energy projects and reduce CO(2) emissions significantly. At the same time, there is no causal linkage between these variables in the short term. Therefore, to achieve sustainable economic growth for environmental issues, governments should implement supportive policies with a long-term approach to boost private participation in the investment of green energy projects. This policy may be applicable during and in the post the COVID-19 era when green projects have more difficulties accessing finance.

Green energy, green finance, and energy efficiency interactions can be addressed as crucial debates in achieving the related sustainable development goals (SDGs), such as affordable and clean energy, climate action, and life on land, relating to planet protection by 2030. Green energy is a critical energy resource underpinning economic flourishing regarding environmental protection and combating carbon emissions. Maji (2015) proved that a 1% increase in green energy consumption contributes to nearly 1.26% economic growth, impressive and considerable for countries under the negative economic consequences of the COVID-19 pandemic. Apergis and Payne (2010) found short-term and long-term bidirectional causal relationships between green energy consumption and economic growth in Organization for Economic Co-operation and Development (OECD) countries. Similarly, green finance can be helpful to green energy project developments that suffer from a lack of capital, especially in the COVID era. Amir and Khan (2021) argued that the economic recession and stagnation caused by the pandemic worldwide (with Abstract Deploying green energy is, directly and indirectly, related to energy-and environment-related sustainable development goals (SDGs). This study uses the stochastic impact by regression on the population, affluence, and technology (STIRPAT) model to examine the relationship between CO 2 emissions, energy efficiency, green energy index (GEI), and green finance in the top ten economies that support green finance. The results show that green bonds are a suitable method to promote green energy projects and reduce CO 2 emissions significantly. At the same time, there is no causal linkage between these variables in the short term. Therefore, to achieve sustainable economic growth for environmental issues, governments should implement supportive policies with a long-term approach to boost private participation in the investment of green energy projects. This policy may be applicable during and in the post the COVID-19 era when green projects have more difficulties accessing finance. a 5.2% contraction in global GDP in 2020 (Khanna 2020) ) had reduced global capital, leading to a lack of investment in green energy projects. Therefore, green finance tools are an essential and valuable solution to attract private partnerships for green projects under capital pressure (Taghizadeh-Hesary & Yoshino, 2020) . Meo and Karim (2021) discussed the significant role of green finance in increasing investment flows to green projects, suggesting a causal link between green energy and green finance.

Another important ongoing issue for countries is the challenge of low energy efficiency. Gielen et al. (2015) stated that energy efficiency is a central issue in combating environmental pollution. Green finance can help enhance energy efficiency by improving green energy projects and absorbing capital to implement knowledge transformation in energy efficiency. Jin et al. (2021) revealed that green finance positively impacts energy efficiency in China.

Assessing the association or causal relationship between green finance, CO 2 emissions, green energy consumption, and energy efficiency is essential and could provide valuable insights for countries. According to earlier studies such as Ren et al. (2020) for China, Charfeddine and Kahia (2019) for the Middle East and North Africa (MENA) regions, and Maji (2015) for Nigeria in the short term, under the circumstances such as unfavorable policy implications, exogenous shocks, and economic structures, there would not be any linkage between green finance, green energy consumption, and energy efficiency. Thus, the study of causal links is informative and valuable for policymakers. However, some countries strongly support the development of the green finance market. Following Meo and Karim (2021) , the top ten economies that support green finance are Canada, Denmark, Hong Kong, Japan, New Zealand, Norway, Sweden, Switzerland, the UK, and the USA. The ten economies that may be called "Green Leaders" display rapid economic growth, urbanization growth, lowering CO 2 emissions, and increasing contribution of renewable energy consumption to their total energy baskets. According to the data obtained from the World Bank database and the British Petroleum Statistical Review of World Energy 2020, Green Leaders experienced an average economic growth of 2.12% during 2000-2019. Over the past two decades, the urbanization growth rate averaged nearly 0.98% in these ten economies. Their overall renewable energy consumption in the total energy basket contributed approximately 22% over 2000-2019. Meanwhile, the level of CO 2 emissions in these countries was approximately 824,200 kt and 729,467 kt in 2000 and 2019, respectively. The trends of these four variables for the Green Leaders are shown in Fig. 1 as follows:

Thus, based on the above explanations, we address two critical issues: first, the linkage between green finance, CO 2 emissions, green energy, and energy efficiency is not similar among countries. The strength of the link in the short and long terms may provide valuable insights for policymakers. Second, Green Leaders consist of nations that differ in scale and energy consumption patterns. The existence of linkages among green energy, CO 2 emissions, green finance, and energy efficiency in these countries would be interesting, especially the direction of a causal link between these variables is still questionable for experts. Analyzing the linkage between variables can help deploy green energy consumption and enhance energy efficiency by promoting green finance. Overall, these steps will help reduce CO 2 emissions in Green Leaders, guiding further policy planning and implementation.

Therefore, this paper seeks to expand the extant literature by these contributions:

i. First, this study is the first of its kind to examine the dynamic linkage among CO 2 emissions, green energy, green finance, and energy efficiency among the Green Leaders. ii. The empirical analysis is based on the stochastic impacts by regression on the population, affluence, and technology (STIRPAT) model (as an appropriate theoretical pattern for analyzing environmental pollution and explanatory variables; Ji and Chen 2017; Debone et al. 2021) addressed in this study for the first time. iii. Moreover, a green energy index (GEI) is constructed based on the principal component analysis (PCA) technique that was employed in the empirical model.

The paper comprises six sections. The "Literature review" section discusses the literature gap. The data and model specifications are presented in the "Data and model specification" section. The empirical findings are discussed in the "Empirical results" section. Some robustness checks are employed to validate the empirical findings in the "Robustness check" section, and a summary of the results and practical policy implications are presented in the "Conclusions and policy implications" section.

The issues of green finance and energy efficiency have drawn the attention of a few scholars. A group of scholars showed that green finance is not an efficient tool in many countries because of various core problems. For instance, Fu and Ng (2021) and Hafner et al. (2020) showed that green finance tools such as green bonds are inefficient in developing or lessdeveloped economies because of the weak private sector and inappropriate financial infrastructure. Consistent with these studies, Hammoudeh et al. (2020) attempted to find a link between green bonds and different economic and environmental indicators and concluded no causal link between green bonds and other variables. Prakash and Mahdvi (2020) found no link between green bonds and SDGs in India due to a financing gap in the private sector and the lack of guidelines with India's climate action plan. Finally, Gibon et al. (2020) analyzed the green bonds issued by the European Investment Banks for green power plants during [2015] [2016] [2017] [2018] . The results showed inefficient fund allocation, which neutralized the green financing effect in green projects.

Contrary to the studies that have found neutral or negative impacts of green finance, a group of studies has depicted the beneficial role of green financing on different macroeconomic variables. For example, Naeem et al. (2021) found green bonds to be more effective than conventional bonds during the COVID-19 era due to their higher transparency in interest rates and investment return. Similarly, Nguyen et al. the Pacific. Their findings proved that green bonds in Asia tend to show higher returns but with higher risks and higher heterogeneity. Generally, the banking sector dominates the Asian green bond market, representing 60% of all issuances. They concluded that in the post-COVID-19 era, issuers' diversification, with higher participation from the public sector and de-risking policies, could also be considered. Wan (2020) investigated the linkage between green finance and SDGs for climate change and environmental threats. The significant findings showed that state support from the banking and financial sectors in developing green financing could attract private investors to this market.

Consequently, green financing development may positively expand green energy projects. Taghizadeh-Hesary and Yoshino (2019) found that green finance plays a significant role in long-term green investments. However, they stated the role of public financial institutions in making these financing tools more efficient. Tolliver et al. (2020) discussed that using green bonds as an appropriate tool for green financing can lower investment risk, increase return on investment, and attract global investors to green energy projects. Liu et al. (2021) studied the role of green bonds' risk on investors' trust and found that risk management in the green bond market can make this financing tool efficient and effective for green energy project development. Meo and Karim (2021) believed that market conditions and the green finance market mechanism are two significant factors in creating a positive relationship between green finance and green energy projects. A positive impact of green finance on boosting green energy projects, mainly small-scale energy investments, was found by Sachs et al. (2019) . Zhang and Wang (2019) and Polzin and Sanders (2020) stated that green finance could help countries reach sustainable renewable energy development by attracting private investors and creating synergy among state and private sectors. Sarangi (2018) studied different aspects of green energy finance in India and found that the growth of the green energy financing market improves green projects, leading to a more significant contribution of green energy to India's total energy basket. Wang and Zhi (2016) argued that the direct and positive impact of green finance on renewable energy development depends on financial market mechanisms and state policies related to green finance. Goldstein (2001) argued that green economic reforms are vital for all countries to boost investment in green energy production, lowering the environmental pollution.

Thus, it can be highlighted that the consequences of using green finance are not similar among countries and depend on different factors. Therefore, the study of green finance in a group of top countries that support this new financing would be practical and bring new insights for these economies and for all other countries wanting to develop green finance markets. Furthermore, exploring how this variable relates to energy efficiency and green energy consumption in these economies is crucial because of their role in realizing SDGs defined by the United Nations in 2015.

This study differs from earlier studies in several aspects. First, the causal linkages between green finance, green energy, and energy efficiency were estimated simultaneously. Second, the causality link among the variables is checked for top green finance supporters globally. The results are essential and bring significant insights. Third, the empirical model consists of the GEI, which includes various green energy resources constructed using the PCA technique. Fourth, the estimation progress is under the STIRPAT approach, confirmed as a reliable analysis framework in energy economics.

Theoretically, using an appropriate framework to determine the environmental impacts of different variables has been widely discussed by scholars. As the first advanced theory, Holdren and Ehrlich (1974) proposed a framework called IPAT (environmental impact generated by population, affluence, and technology). In 2002, Waggoner and Ausubel modified the IPAT approach to ImPACT, including consumption per unit of gross domestic product (GDP). However, these approaches suffer from limitations, such as a lack of dynamic analyses and inconsistencies in the impacts of influential factors (York et al., 2003) . To solve these issues, a more advanced approach called STIRPAT, considering different variables in a regression form, was proposed by Rosa (1994, 1997) . Bargaoui et al. (2014) and Gani (2021) expressed STIRPAT as the best theoretical approach to clarify the relationship between environmental pollution and explanatory variables. The theoretical equation for STIRPAT can be defined as Eq. 1:

where I denotes the environmental impact in country i and P and A represent population and affluence. Furthermore, T is technology, and e is the error term. α scales the model, and b, c, and d show the estimated exponents of each factor (population, affluence, and technology).

Following Wang et al. (2020) , the STIRPAT model in Eq.1 can be rewritten in its logarithmic form as Eq. 2:

where α indicates a constant and b, c, and d represent the exponents of population, affluence, and technology, respectively. e is the error term, and t represents the time. Regarding the dependent variable (I), we follow Zheng et al. (2016) and Wang et al. (2020) . They consider CO 2 emissions per capita to represent I. Moreover, the population is considered for P; A means GDP per capita and energy intensity. Finally, issued green bonds and GEI are entered into our empirical model for T. Table 1 presents the variables used in our model:

The GEI, based on green energy consumption, is generated using the PCA technique, considering nuclear, hydro, solar, wind, and biofuel consumptions. Before conducting the PCA analysis, the Kaiser-Meyer-Olkin (KMO) test and Bartlett test were (1)

ln

performed to determine the suitability of the data for factor analysis. As the KMO and Bartlett values are calculated as 0.83 and 0.001, respectively, the PCA technique can be employed for these variables. The PCA results are reported in Table 2 . It can be concluded that A1 has an eigenvalue >1 and explains 67.4% of the total variance of green energy consumption among the ten Green Leaders. Therefore, A1 was added to our model as GEI.

Additionally, to understand the contributions of each variable in component A1, the factor loadings are presented in Table 3 .

The results in Table 3 prove that hydro and wind consumption is higher than other green energy consumption methods in the selected component of A1.

The generalized method of moments (GMM) estimation approach is selected to explore the Granger causal linkages between the variables through Eq. 3 for the annual data covering 2002-2018. In Eq. 3, COPC is the CO 2 emissions per capita, POP is the country's population size, GDPPC represents GDP per capita, and EI and GB are energy intensity and issued green bonds and GEI. Additionally, a panel unit root test and co-integration analysis were conducted to ensure the reliability of the empirical estimation. In this study, the augmented Dickey-Fuller test (Dickey and Fuller, 1979) , Phillips and Perron (1988) , Breitung (2000) , and Levin-Lin-Chu (LLC) (Levin et al. 2002) as the first generation of unit root tests were performed. Carrion-i-Silverstre et al. (2005) unit root test with structural breaks was performed to validate the panel unit root results. Next, the panel co-integration test was employed to explore the long-term equilibrium situation among the variables. Accordingly, two tests proposed by

(3) Westerlund (2007) and Maddala and Wu (1999) were carried out for our model. If there existed a long-term relationship among variables, the augmented mean group (AMG) estimation technique was applied to estimate the long-term coefficients of the explanatory variables.

The panel error correction model was used to determine the causal linkages among variables. Finally, as robustness checks, the fully modified ordinary least squares (FM-OLS) estimator and common correlated effect mean group estimator (CCEMG) estimators were carried out to re-estimate the coefficients. The empirical results are presented in the "Empirical results" section. Additionally, the following conceptual framework (Fig. 2) shows the required steps to conduct the paper.

First, the panel unit root tests were performed, and the results have been reported in Tables 4 and 5.

The findings of the panel unit root tests, shown in Table 3 , conclude that all the variables have unit roots at levels while they become stationary at the first level.

Considering the structural breaks, the panel unit root test results presented in Table 4 prove the rejection of H0 of the stationary series.

The overall conclusion from the panel unit root tests, presented in the above tables, is that the variables are not stationary at their levels, while all Tables 5 and 6 . The evidence from the results, shown in Tables 6 and 7, indicates that a long-term relationship exists between CO 2 emissions per capita and the explanatory variables. Next, regression estimations are carried out using the augmented mean group estimator (AMG). The results are presented in Table 8 .

The estimated coefficients reveal the positive impact of the two variables of population and GDP per capita on CO 2 emissions per capita among the Green Leaders. This increase in these two explanatory variables leads to higher air pollution due to CO 2 emissions. Identifying a positive coefficient of GDP per capita and total population regarding CO 2 emissions is consistent with Tucker (1995), Akalpler and Hove (2019), and Aslam et al. (2021) for CO 2 emissions-GDP linkage and with Knapp and Mookerjee (1996) , Yeh and Liao (2017) , and Rehman et al. (2021) for CO 2 emissions-population linkage. The main reason for the positive impact of these two variables is the more significant energy consumption, which accelerates CO 2 emissions. The results prove that higher energy intensity, a proxy for energy efficiency, accelerates CO 2 emissions, implying that among the Green Leaders, a 1% increase in energy intensity (contribution of energy to economic size) accelerates pollutant emissions by approximately 0.09% in the long term. This is consistent with Shahbaz et al. (2015) and Namahoro et al. (2021) for select African countries.

Green bond issuance as a proxy for green finance favors green energy deployment and reduces CO 2 emissions per capita. This variable's estimated coefficient suggests that a 1% increase in the volume of issued green bonds reduces CO 2 emissions by approximately 1% in these countries. Peri (2019), Wang et al. (2021) , Loffler et al. (2021) , and Meo and Karim (2021) have proved a similar result for different countries, while Mensi et al. (2021) observed the inefficiency of issued green bonds.

The GEI can help these countries to combat CO 2 emissions. The estimated coefficient indicates that a 1% increase in the GEI based on green energy consumption can decrease CO 2 emissions by approximately 0.92% in the long term. Additionally, several earlier studies have shown the positive effect of renewable energy deployment on reducing CO 2 (e.g., see Lysen (1989) for solar energy, Hanaki and Portugal-Pereira (2018) for biofuels, Li et al. (2020) for wind energy, and Hassan et al. (2020) for nuclear energy).

Next, the Granger causality test (short-term linkage) based on the panel error correction model (P-ECM) was implemented to determine the direction Table 9 . Based on the coefficients, it can be shown that population, GDP per capita, and energy intensity cause CO 2 emissions per capita in these countries. However, there is no causal linkage between issued green bonds and CO 2 emissions per capita and GEI and CO 2 emissions per capita. Additionally, there is a bidirectional causal relationship between the issued green bonds and the GEI in the short term. Furthermore, a bidirectional relationship between issued green bonds and GDP per capita is found in the short term, which would be interesting for policymakers in these countries. Any support from green finance tools may increase GDP per capita, a significant aspect of social welfare in a country.

Various robustness checks were conducted. First, the empirical model was re-estimated using the other two estimators--FMOLS and CCEMG--to ensure the validity of the empirical estimations. As shown in Table 10 , the estimated coefficients of the explanatory variables have the same direction. However, the magnitude of the impacts was different compared to the AMG estimation results. The second robustness check is based on variable substitution. We replace the dependent variable of CO 2 emissions per capita with CO 2 emissions from fossil fuels and re-estimate the model using the AMG estimator to check the validity of the estimated coefficients of issued green bonds (a proxy for green finance), GEI, and energy intensity (a proxy for energy efficiency). The estimation results, reported in Table 11 , reveal the efficiency of issued green bonds and the increase in the GEI to reduce CO 2 emissions from fossil fuels. Furthermore, the positive impact of energy intensity on CO 2 emissions from fossil fuels has been confirmed.

Scholars debate the relationship between green finance, green energy consumption, and energy efficiency. This study investigates this relationship by modeling the STIRPAT theoretical approach for the Green Leaders. The annual data for 2002-2018 were gathered, and econometric estimations were conducted based on the panel data framework.

The significant empirical findings reveal that: In the long term:

i. An increase in the total population of these countries and a higher GDP per capita without energy transition and switching to clean energy may increase CO 2 emissions. ii. The issuance of green bonds makes access to financial resources easier, favoring green energy deployment and reducing CO 2 emissions per capita. This variable's estimated coefficient suggests that a 1% increase in the volume of green bonds reduces CO 2 emissions by approximately 1%. Additionally, in the short-term:

i. The Granger causality test shows that increased population, GDP per capita, and energy intensity can lead to higher CO2 emissions per capita. ii. There is no causal linkage between issued green bonds and CO 2 emissions per capita and between GEI and CO 2 emissions per capita. iii. There is a bidirectional causal relationship between the issued green bonds and the GEI in the short term. iv. A bidirectional relationship between issued green bonds and GDP per capita was found.

The empirical evidence shows that green finance and green energy deployment can only help countries reduce CO 2 emissions in the long term. However, they play an essential role in accelerating GDP per capita in the short and long terms. Thus, to achieve sustainable economic growth concerning environmental issues, governments should implement support policies with a long-term approach to boost private participation in the investment of green energy projects. Thus, providing remittance of earnings and return on investment would be two major ways of encouraging the private sector to invest in green projects. Additionally, increasing the volume of issued green bonds as suitable green finance seems to be another key element in restoring economic growth in the short and long terms. This financial tool may ensure appropriate investment returns for private investors. This policy may be more applicable during and the post-COVID-19 era. Due to the consequences of the pandemic, the lack of capital in green projects and economic recession has become a global debate. Additionally, policymakers should pay attention to energy efficiency to reduce energy intensity and environmental pollution. Accordingly, using international best practices is recommended, such as the EU energy efficiency plan, National Energy Efficiency Action Plan (NEEAP), Thailand 20-Year Energy Efficiency Development Plan, Energy Saving Improvement Program (ESIP), and Turkey's Strategic Energy Efficiency Plan (SEEP). Regarding the shortterm inefficiency of green finance and green energy consumption in reducing CO 2 emissions among the Green Leaders, policymakers should increase green energy use in electricity generation and industrial sectors, which are the two major CO 2 emitting sectors. Moreover, prioritizing green energy projects based on financial indicators and CO 2 emissions would be a fruitful policy in these countries.

Despite providing fresh and significant conclusions and policy implications, one of the limitations of this study is that econometric analysis is not applied at the country level. Therefore, investigating the relationship between green finance and green energy consumption on CO 2 emissions at the country level is recommended for further studies.

Carbon emissions, energy use, real GDP per capita and trade matrix in the Indian economy-an ARDL approach

Assessment of renewable energy: Status, challenges, COVID-19 impacts, opportunities, and sustainable energy solutions in Africa. Energy and Build Environment

Renewable energy consumption and economic growth: Evidence from a panel of OECD countries

The nexus of industrialization, GDP per capita and CO2 emission in China

Environmental impact determinants: An empirical analysis based on the STIRPAT model

The local power of some unit root tests for panel data

Breaking the panels: An application to the GDP per capita

Impact of renewable energy consumption and financial development on CO2 emissions and economic growth in the MENA region: A panel vector autoregressive (PVAR) analysis. Renewable Energy

Modelling approach for carbon emissions, energy consumption and economic growth: A systematic review

Distribution of the estimators for autoregressive time series with a unit root

Rethinking the environmental impacts of population, affluence and technology

Effects of population and affluence on CO2 emissions

Scaling up renewable energy assets: Issuing green bond via structured public-private collaboration for managing risk in an emerging market

Fossil fuel energy and environmental performance in an extended STIRPAT model

Shades of green: Life cycle assessment of renewable energy projects financed through green bonds. Environmental Research Letters

Synergies between renewable energy and energy efficiency

Financial sector reform and sustainable development: The case of Costa Rica

Closing the green finance gap -A systems perspective

Relationship between green bonds and financial and environmental variables: A novel time-varying causality

The effect of biofuel production on greenhouse gas emission reductions

Is nuclear energy a better alternative for mitigating CO2 emissions in BRICS countries? An empirical analysis

Human population and the global environment

Assessing the energy-saving effect of urbanization in China based on stochastic impacts by regression on population, affluence and technology (STIRPAT) model

The financing efficiency of listed energy conservation and environmental protection firms: Evidence and implications for green finance in China

COVID-19: A cloud with a silver lining for renewable energy?

Population growth and global CO2 emissions: A secular perspective

Unit root tests in panel data: Asymptotic and finite sample properties

Research on carbon emission reduction benefit of wind power project based on life cycle assessment theory

Dependence and risk spillovers between green bonds and clean energy markets

Drivers of green bond issuance and new evidence on the greenium

Climate and energy: The feasibility of controlling CO2 emissions

A comparative study of unit root tests with panel data and a new simple test

Does clean energy contribute to economic growth? Evidence from Nigeria

Upside-downside multifractality and efficiency of green bonds: The roles of global factors and COVID-19. Finance Research Letters

The role of green finance in reducing CO2 emissions: An empirical analysis. Borsa Istanbul Review

Comparative efficiency of green and conventional bonds pre-and during COVID-19: An asymmetric multifractal detrended fluctuation analysis

Impact of energy intensity, renewable energy, and economic growth on CO2 emissions: Evidence from Africa across regions and income levels

Time-frequency comovement among green bonds, stocks, commodities, clean energy, and conventional bonds

Testing for a unit root in time series regression

How to finance the transition to low-carbon energy in Europe? Energy Policy

Green bonds driving sustainable transition in Asian economies: The case of India

Towards environmental sustainability: Devolving the influence of carbon dioxide emission to population growth, climate change, forestry, livestock and crops production in Pakistan

Nexus between green finance, non-fossil energy use, and carbon intensity: Empirical evidence from China based on a vector error correction model

Why is green finance important?

Green energy finance in India: Challenges and solutions

Does energy intensity contribute to CO2 emissions? A trivariate analysis in selected African countries

The way to induce private participation in green finance and investment

Sustainable solutions for green financing and investments in renewable energy projects

Analyzing the characteristics of green bond markets to facilitate green finance in the post-COVID-19 world

Policy targets behind green bonds for renewable energy: Do climate commitments matter?

Carbon dioxide emissions and global GDP

Green finance and sustainable development goals: The case of China

The role of green finance in environmental protection: Two aspects of market mechanism and policies

The STIRPAT analysis on carbon emission in Chinese cities: An asymmetric laplace distribution mixture model. Sustainability

Discovering research trends and opportunities of green finance and energy policy: A data-driven scientometric analysis

Testing for error correction in panel data

Impact of population and economic growth on carbon emissions in Taiwan using an analytic tool STIRPAT

STIRPAT, IPAT and ImPACT: Analytic tools for unpacking the driving forces of environmental impacts

The effect of green finance on energy sustainable development: A case study in China. Emerging Markets Finance and Trade

Examining determinants of CO2 emissions in 73 cities in China

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Acknowledgements Farhad Taghizadeh-Hesary acknowledges the financial support of the Grant-in-Aid for Excellent Young Researcher of the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT).Author contribution Conceptualization, Ehsan Rasoulinezhad and Farhad Taghizadeh-Hesary; formal analysis, Ehsan Rasoulinezhad and Farhad Taghizadeh-Hesary; methodology, Ehsan Rasoulinezhad; supervision, Farhad Taghizadeh-Hesary; writing-original draft, Ehsan Rasoulinezhad; and writingreview and editing, Farhad Taghizadeh-Hesary.

The authors declare no competing interests.