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Analyzing asymmetric effects of cryptocurrency demand on environmental sustainability
(Springer Heidelberg, 2022) Erdogan, Sinan; Ahmed, Maruf Yakubu; Sarkodie, Samuel Asumadu
When bitcoin (BTC), the first pioneering cryptocurrency was released in 2009, it was considered an apolitical currency. Besides, the possible effect of BTC and other cryptocurrencies on either financial markets or transactions has been widely discussed. However, the environmental effects of cryptocurrency demand have been ignored. Here, this study examines the nexus between cryptocurrencies and environmental degradation by employing standard and asymmetric causality methods. The Toda-Yamamoto and bootstrap-augmented Toda-Yamamoto test results reveal Bitcoin and Ethereum (ETH) excluding Ripple (XRP) have causal effects on environmental degradation. The Fourier-augmented Toda-Yamamoto test results show causal effects running from Bitcoin and Ripple to environmental degradation, whereas no causal effect runs from Ethereum to environmental degradation. The asymmetric causality shows causal effects from the positive shock of Bitcoin demand, negative shocks of Ripple and Ethereum demands to positive shocks of environmental degradation. Further discussions and policy implications are provided in the relevant sections of this study.
Analyzing the asymmetric effect of disaggregated health expenditures on economic growth
(Springer Science and Business Media B.V., 2023) Erdogan, Sinan; Erdogan, Eyup Serdar
Even though health expenditures are one of the significant determinants of accumulation of human capital and economic growth, researchers have paid less attention to unveiling interactions between health care expenditures and economic performance. The main objective of this study is to investigate disaggregated health care expenditures and economic growth nexus in Türkiye from 1979 to 2019 by using an asymmetric causality approach. The main empirical findings could be briefly summed up as follows: there exist asymmetric causal effects running from total health expenditures, out-of-pocket health expenditures and voluntary health expenditures to economic growth, while there is no asymmetric causal effect from compulsory health expenditures to economic growth. The policy inferences of empirical results for enhancing the productivity of health expenditures are stated in the body of the paper. © 2022, The Author(s), under exclusive licence to Springer Nature B.V.
Analyzing the EKC hypothesis for technologically advanced countries: The role of ICT and renewable energy technologies
(Elsevier Sci Ltd, 2023) Pata, Ugur Korkut; Kartal, Mustafa Tevfik; Erdogan, Sinan
International initiatives, such as the Paris Climate Conference and the COP26 conference, have highlighted the role of technology in fighting environmental problems. However, it is uncertain whether technologies are beneficial in curbing carbon dioxide (CO2) emissions. To find an answer to this question, the study focuses on four technologically advanced countries (United Kingdom, Switzerland, Norway, Denmark), considers infor-mation and communication technologies (ICT), renewable energy technologies (RRD), and economic growth in relation to environmental degradation, and tests the validity of the environmental Kuznets curve (EKC). The study applies Fourier approaches and uses data for the period 1989-2020. In this way, the study defines that (i) ICT and RRD are cointegrated with CO2 emissions; (ii) ICT mitigates environmental degradation in the United Kingdom, Denmark, Switzerland, and Norway; (iii) RRD expenditures, however, are not effective in reducing CO2 emissions; (iv) the EKC hypothesis is also validated for the countries studied. Thus, the study highlights the need for countries to rely on further use of ICT and income growth as effective policy instruments to mitigate CO2 emissions rather than RRD.
Analyzing the environmental Kuznets curve hypothesis: The role of disaggregated transport infrastructure investments
(Elsevier, 2020) Erdogan, Sinan
The provision of affordable and sustainable transport systems is a crucial issue for both the establishment of sustainable cities and the development of society. It is a significant part of the Sustainable Development Goals (SDGs). In this paper, we aimed to unveil interactions between infrastructure investments in transport systems and environmental degradation in 21 Organisation for Economic Co-operation and Development (OECD) countries. The empirical findings can be summed up as follows: (a) there is a long-run relationship between variables; (b) gross domestic product (GDP) per capita has a positive and statistically significant coefficient, while GDP per capita square has a negative statistically significant coefficient, and therefore, the environmental Kuznets curve (EKC) hypothesis is valid (c) additionally, rail infrastructure investment has a negative and statistically significant parameter sign, whereas road and air infrastructure investments have a positive and statistically significant parameter sign; and (d) trade openness has a positive and statistically significant coefficient. Hence, rail investment helps achieve the establishment of sustainable transport systems and low-environmental pollution targets of SDGs, whereas road and air investments hamper their establishment.
Analyzing the tourism development and ecological footprint nexus: Evidence from the countries with fastest-growing rate of tourism GDP
(Springer, 2020) Okumus, Ilyas; Erdogan, Sinan
Sustainable development is a holistic approach that aims to do future-friendly planning with its economic, environmental and social dimensions by establishing a balance between the needs of human life and the sustainability of natural resources. Tourism, contributing to the economic development of both developed and developing countries, includes environmental, social and economic dimensions of sustainable development with this structure. Therefore, analyzing tourism development and environmental quality nexus is a crucial issue for policymakers to design effective policies for a sustainable life. The main purpose of this study is to investigate the impacts of tourism investments on the ecological footprint in the six countries (Ecuador, Egypt, Turkey, Uzbekistan, Tunisia and Sri Lanka), which are in the top 20 countries, fastest-growing in terms of tourism GDP over the period of 1995-2014. In addition to tourism investments, our quadratic EKC model includes economic growth, energy use and individual internet use as independent variables. Empirical findings reveal that tourism investments and internet uses have negative impacts on ecological footprint. On the other hand, energy consumption increases environmental degradation. Also, the existence of the EKC is confirmed in these countries. © The Author(s) 2021. All rights reserved.
Analyzing transport demand and environmental degradation: the case of G-7 countries
(Springer, 2024) Erdogan, Sinan; Sarkodie, Samuel Asumadu; Adedoyin, Festus Fatai; Bekun, Festus Victor; Owusu, Phebe Asantewaa
The debate for green development has been ongoing in the energy and environment literature-especially initiatives to mitigate climate change. On this note, we explore the effects of the air and railway transport demand, fossil-fuel energy consumption, demographic policies, economic growth, and alternative energy consumption on environmental degradation in Group of Seven (G7) economies. Using robust panel estimation techniques that account for cross-sectional dependence, empirical results affirm the presence of long-run relationships among variables. Besides, the results give credence to the environmental Kuznets curve hypothesis (EKC) in G7 countries over the sampled period. We observe that demand for air transport, energy from fossil fuel sources, and economic development dampen environmental quality by 0.12%, 0.33%, and 46.54%, respectively. Interestingly, renewable energy and rail transportation demand improve environmental quality. This outcome resonates with the need for alternative and clean energy production and consumption (Sustainable Development Goals 11 and 12) while enhancing the fight against climate change-especially the adoption of clean energy technologies in the air transport sector for sustainable growth.
Are shocks to disaggregated energy consumption transitory or permanent in Turkey? New evidence from fourier panel KPSS test
(Pergamon-Elsevier Science Ltd, 2020) Erdogan, Sinan; Akalin, Guray; Oypan, Oguz
The investigation of the stationarity property of energy consumption has recently been a challenge for researchers in energy economics and important for consistent policy proposals. This study uses a set of conventional unit root tests and a recently developed Fourier panel KPSS test to investigate the persistence of shocks in disaggregated energy consumption data in Turkey from 1970 to 2016. The empirical results are as follows. First, the results of the unit root tests with no structural breaks reveal that energy consumption is overwhelmingly nonstationary in regard to sectoral energy consumption, except for the government's consumption; additionally, panel statistics also indicate that energy consumption is nonstationary. Second, the results of the stationarity test that allows multiple structural breaks reveal that sectoral energy use is stationary, but the panel results are controversial. Third, the Fourier panel KPSS test shows that energy use is nonstationary at both the sectoral and the panel level. Overall, the empirical findings indicate that disaggregated energy use is nonstationary, and that the effects of possible shocks on energy consumption in Turkey are permanent. Therefore, stabilization policies on energy consumption are required to avoid a possible spillover effect of energy shocks on other macroeconomic variables. (C) 2020 Elsevier Ltd. All rights reserved.
Assessing decarbonization: a comparison of the green sacrifice ratio for China and India
(Taylor & Francis Inc, 2024) Erdogan, Sinan; Pata, Ugur Korkut; Kartal, Mustafa Tevfik
Carbon mitigation and net-zero targets have an important place on the political agenda for all countries. Countries have been seeking to decouple economic growth and carbon emissions to achieve decarbonization. However, there is a cost of the decarbonization of economies, which can be called as Green Sacrifice Ratio (GSR), and this is critical for developing countries because they have been in the growing stage. By considering the critical role of GSR in achieving net-zero emissions by decarbonizing economies, the study comparatively examines how much environmental quality should be sacrificed for per capita economic growth in China and India. In line with this purpose, the study uses the Fourier-Shin cointegration test and various time series estimators with Fourier approximations for the period from 1989/Q1 to 2022/Q4. Estimation results are as follows: (i) all variables follow the non-stationary process, (ii) the long-run relationship exists between variables, and (iii) Estimation results show that GSR is 0.65% for China and 0.78% for India. Therefore, China and India sacrifice a significant amount of environmental quality for a 1% increase in per capita income level. Also, the ecological cost of increasing economic welfare in India is higher with regard to China. Besides, the results are robust according to the alternative method. Thus, the study recommends that both Chinese and Indian policymakers should revise the economic expansion structure with green growth strategies to prevent irreversible environmental degradation due to higher economic growth.
Assessing the Economic Impacts of Tourism Markets and Activities Diversification: Evidence From a New Dynamic Regression Approach
(Sage Publications Inc, 2023) Solarin, Sakiru Adebola; Ulucak, Recep; Erdogan, Sinan
This paper undertakes an exploration of how the diversification of tourism markets and activities exerts its influence on economic growth, particularly in New Zealand. By employing a dynamic autoregressive distributed lag method, this study uncovers the interplay between tourism diversification and economic growth dynamics in New Zealand. Empirical results show that it is only the diversification of European markets that generated positive economic growth. However, the diversification of tourism activities emerges as a potent driver of favorable economic expansion. The evidence suggests that a strategic emphasis on augmenting tourism diversification from European markets holds the potential to magnify the positive economic impact of the tourism sector. Additionally, the proposition of enhancing diversification in tourism activities emerges as a key avenue for bolstering New Zealand's economic growth prospects. This study bridges a gap in the existing literature and furnishes policymakers with insights on how to harness the potential of tourism diversification.
Associating environmental quality, human capital, financial development and technological innovation in 19 middle-income countries: A disaggregated ecological footprint approach
(Elsevier Sci Ltd, 2024) Aytun, Cengiz; Erdogan, Sinan; Pata, Ugur Korkut; Cengiz, Orhan
The influence of human capital accumulation and technological innovation on the environment is one of the most significant topics in the environmental literature. The main goal of this research is to examine the influence of human capital (HC), technological innovation, and financial development (FD) on the ecological footprint (EF) and its subcomponents for 19 middle-income countries from 1980 to 2016. To this end, the study employs the cross-sectionally augmented autoregressive distributed lag (CS-ARDL) method. Empirical evidence reveals that economic expansion upsurges aggregated the EF, while HC and FD reduce ecological pollution. Technological innovation does not have a statistically significant impact on the EF. The findings of the study imply that the increase in technological progress does not contribute to achieving the sustainable development goals (SDGs) for middle-income countries, while HC and FD play an environmentally friendly role. Therefore, to minimize the negative impact of economic development on the environment, policymakers in middle-income countries should encourage FD, allocate resources to promote HC development, and use environmental awareness programs as a tool to achieve the SDGs.
Convergence analysis of ammonia emissions by sector and fuel source in OECD countries from 1750 to 2019 using a new Fourier-centric wavelet approach
(Springer Heidelberg, 2022) Solarin, Sakiru Adebola; Erdogan, Sinan; Bello, Mufutau Opeyemi
Although ammonia emissions are not as huge as carbon and methane emissions, they pose significant threats to ensuring environmental sustainability and productivity. However, the existing literature has paid less attention to the underlying characteristics of ammonia emissions. The chief target of this study is to investigate the stochastic convergence of ammonia emissions at the aggregate level, by sector, and by fuel source in 37 Organization for Economic Cooperation and Development countries for more than two centuries of data. Using a newly proposed Fourier-augmented wavelet unit root test, the empirical findings reveal that the relative ammonia emissions series in most Organization for Economic Cooperation and Development countries follow the unit root process in the aggregate, sectoral, and fuel-specific analyses. Therefore, these findings refer to the existence of divergence, while stochastic convergence does not exist in most cases. Having a divergent pattern of ammonia emissions has several policy implications for policymakers in the context of environmental sustainability. (i) Relative ammonia emission cannot revert to its steady-state path without policy intervention, (ii) policymakers have a chance of affecting the dynamics of ammonia emissions in Organization for Economic Cooperation and Development countries. (iii) As a policy response, the study recommends the pursuant of national environmental policies with consideration to the unique characteristics of the individual countries as the non-existence of convergence of environmental series could result in a diverse level of consciousness of environmental degradation among countries with divergent patterns on emissions levels.
The convergence behavior of CO2 emissions in seven regions under multiple structural breaks
(Econjournals, 2016) Acaravci, Ali; Erdogan, Sinan
The aim of this paper is to examine the convergence behavior of carbon dioxide emissions per capita (co) in seven regions for 1960-2011 period by using recently developed the second generation panel data methods. Empirical results are as follows: (i) There exists cross-sectional dependency for co variable, (ii) the cross-sectionally augmented Dickey Fuller unit root test without structural breaks shows that the co variable is stationary at its first differences, (iii) but the panel KPSS unit root test with structural breaks the co variable is stationary at its level. The overall results indicate that the regional stochastic convergence of carbon emission per capita is valid for the seven regions under structural breaks and any environmental shock has temporary effect. © 2016, Econjournals. All rights reserved.
Convergence of Income Inequality in OECD Countries Since 1870: A Multi-Method Approach with Structural Changes
(Springer, 2023) Solarin, Sakiru Adebola; Erdogan, Sinan; Pata, Ugur Korkut
This paper aims to examine convergence of income inequality in 21 OECD countries using several empirical techniques. In particular, we have used a new panel stationarity test, which allows for structural changes and cross-sectional dependence to examine the stochastic convergence of income inequality. We also employed a time series approach, residual augmented least squares-Lagrange multiplier unit root test. The empirical results show evidence for absolute, conditional, and sigma convergence. The conditional convergence test results suggest that countries are converging, but conditional on the two structural factors-economic and population growth. The stochastic convergence test results indicate the existence of convergence at the country-specific level. The results further confirm the existence of convergent clubs among OECD countries.
Do dependence on fossil fuels and corruption spur ecological footprint?
(Elsevier Science Inc, 2021) Akalin, Guray; Erdogan, Sinan; Sarkodie, Samuel Asumadu
Corruption, a benchmark for institutional quality plays a critical role in achieving sustainable development, especially in developing countries. The nexus between corruption and economics is widely discussed in economic literature, however, the nexus between corruption and environmental degradation has received less attention. Here, we investigate the relationship between corruption and environmental degradation by accounting for income, urbanization, and disaggregate energy consumption in Newly Industrialized Countries from 1984 to 2016. Utilizing panel data methods, the empirical results reveal the existence of a long-run relationship between environmental degradation and regressors. Corruption, economic growth, and fossil fuel utilization have positive and statistically significant effect on environmental degradation, whereas renewable energy consumption has negative and statistically significant effect on environmental degradation. Besides, urbanization has positive but statistically insignificant effect on environmental degradation. The results reveal corruption poses a risk to the achievement of environmental aims of Sustainable Development Goals in Newly Industrialized Countries.
Do investments in green energy, energy efficiency, and nuclear energy R&D improve the load capacity factor? An augmented ARDL approach
(China Univ Geosciences, Beijing, 2024) Jin, Xin; Ahmed, Zahoor; Pata, Ugur Korkut; Kartal, Mustafa Tevfik; Erdogan, Sinan
Renewable energy, energy efficiency, and nuclear energy research and development (RER, EER, and NER) budgets are immensely important to fulfill sustainable development goals 7, 9, and 13, by accelerating energy innovation, energy transition, and climate control. The literature on the drivers of the load capacity factor (LCF), a recently developed ecological quality measure, is mounting; however, the roles of energy investments in the LCF are largely unknown. Accordingly, this study assesses the impacts of RER, EER, NER, and financial globalization (FIG) on the LCF using data from 1974 to 2018 for Germany. Advanced and reliable time series tests (Augmented ARDL, DOLS, and Fourier causality) are adopted to analyze cointegration, long-run impacts, and causal connections. The outcomes unveil that both green energy and energy efficiency R&D promote the LCF by enhancing ecological quality. However, the positive impact of NER on the LCF is found to be weaker than the impacts of RER and EER. FIG curbs ecological degradation by expanding the LCF. Additionally, the U-shaped connection between economic growth (ECG) and the LCF confirms the load capacity curve. Therefore, policymakers should focus on RER and EER to preserve the environment and promote sustainable growth. (c) 2023 China University of Geosciences (Beijing) and Peking University. Published by Elsevier B.V. on behalf of China University of Geosciences (Beijing). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Do patents, renewable energies and energy taxes in the transport sector reduce transportation carbon emissions in the European Union?
(Taylor & Francis Inc, 2024) Pata, Ugur Korkut; Erdogan, Sinan; Pata, Selin Karlilar; Kartal, Mustafa Tevfik
Transportation infrastructure plays a significant role in exacerbating climate change as it contributes to a substantial increase in carbon dioxide (CO2) emissions. The sole economic sector in which European countries have not succeeded in reducing greenhouse gas (GHG)emissions is the transportation industry. Therefore, reducing transport-related emissions is a primary focus of emphasis in the European Union's efforts to meet its climate targets. Accordingly, this study analyzes the impact of renewable energy use, patent development, and energy taxes in the transport sector on the three different modes of transport-related emissions (aviation, road, and rail) in the 10 highest-income countries of the European Union over the period 2008-2020. The study uses the novel half-panel jackknife estimator for this analysis. The results of the estimation show that patents contribute to the reduction of CO2 emissions in aviation and rail transportation, while renewable energies are only effective in rail transportation. In the context of road transportation, energy taxes are effective in mitigating CO2 emissions. Based on these findings, it is recommended that European Union policymakers promote the use of electric vehicles and eco- friendly means of transportation in road transport through energy taxes, increase the use of renewable energy sources such as biodiesel in rail transport, and reduce CO2 emissions by supporting patents that promote green innovations in the aviation sector.
Does Climate Change Cause an Upsurge in Food Prices?
(Mdpi, 2024) Erdogan, Sinan; Kartal, Mustafa Tevfik; Pata, Ugur Korkut
Climate change is the reason behind most contemporary economic problems. The rising inflationary pressures in the food sector are one of these problems, and stable food prices are a necessity for economic development and social cohesion in societies. Therefore, this study analyzes the relationship between food prices and climate change in Nigeria by using various non-linear and quantile-based methods and data from 2008m5 to 2020m12. The empirical findings indicate that (i) there is a time- and frequency-based dependence between food prices and some explanatory variables, including climate change (i.e., temperature). (ii) At higher quantiles, temperature, oil prices, food exports, monetary expansion, global food prices, agricultural prices, and fertilizer prices stimulate food prices. (iii) The increase in food prices due to the rise in temperature and the difficulties in agriculture indicate that the heatflation phenomenon is present in Nigeria. The evidence outlines that Nigerian decisionmakers should adopt a national food security policy that considers environmental, agricultural, and monetary factors to stabilize food prices.
Does democracy help reduce environmental degradation?
(Springer Heidelberg, 2021) Akalin, Guray; Erdogan, Sinan
The main purpose of this study is to examine the democracy-environmental degradation nexus in 26 Organization for Economic Cooperation and Development (OECD) countries from 1990 through 2015 by using panel data estimation methods, performing well under cross-sectional dependence. Empirical results are as follows: (i) Tests show that cross-section dependence exists among panel members, and slope coefficients are heterogeneous, respectively, and (ii) long-term coefficient estimation results with Augmented Mean Group estimator show that democracy, non-renewable energy consumption, and real income per capita have statistically significant negative effects on environmental quality, whereas renewable energy consumption has a positive effect. There is also no statistically significant relationship between urbanization and environmental quality. These findings show the poor functioning of democracy in addressing environmental issues among OECD countries; therefore, raising environmental quality conflicts with the Sustainable Development Goals (SDGs) of creating strong institutions and economic growth targets. Moreover, promoting renewable energy consumption may be an effective alternative in reducing environmental degradation; therefore, it can be said that promoting clean energy use and raising the SDG environmental quality targets are in harmony.
Ecological effects of distinct patents on reducing waste-related greenhouse gas emissions in BRIC countries: evidence from novel quantile methods
(Taylor & Francis Inc, 2024) Pata, Ugur Korkut; Kartal, Mustafa Tevfik; Erdogan, Sinan
Technological development and environmental patents have become one of the policy options to solve the problem of global warming. With the development of technology, waste recycling can be faster and more environmentally friendly, which can contribute to the reduction of greenhouse gasses. The question of which patents and technologies should be promoted for waste management is an important decision-making and research topic. Given the increasing importance of ecological patents and waste disposal for environmental sustainability, this study examines the impact of technological progress on reducing waste-related greenhouse gas (WGHG) emissions in BRIC countries. The study considers energy generation and transmission-related patents (EPAT), patents to prevent pollution in the production process of goods (GPAT), and waste management-related patents (WPAT) as technological progress indicators. Methodologically, the study the applies novel quantile-on-quantile regression (QQ), Granger causality-in-quantiles (GQ), and quantile regression (QR) for the period from 1997m5 to 2019m12. The findings demonstrate that at higher quantiles, (i) EPAT have a dampening effect on WGHG in Brazil and India; (ii) GPAT have a diminishing effect on WGHG in Brazil, Russia, and India; (iii) WPAT have a diminishing effect on WGHG in Brazil, Russia, and India. Overall, technological progress contributes to WGHG emissions reduction in Brazil and India, while EPAT is not beneficial for Russia, and China cannot benefit from patents. The results suggest that Brazil, Russia and India should financially support and disseminate distinct patents to reduce WGHG emissions and improve waste management.
Economic and Institutional Determinants of Corruption: The Case of Developed and Developing Countries
(Springernature, 2023) Acaravci, Ali; Artan, Seyfettin; Hayaloglu, Pinar; Erdogan, Sinan
Since ancient times, corruption has been one of the essential topics for economists and politicians. Moreover, it is a concern for both developed and developing countries and a significant obstacle to economic development. The primary objective of this paper is to examine the relationships between corruption, economic growth, internet use, and quality of governance alongside other institutional and economic variables in 65 developed and developing countries for the period 1999-2016 by using dynamic panel data methods performing well under cross-sectional dependence. The empirical results can be summarized as follows. The augmented mean group (AMG) results indicate statistically significant relationships between corruption, economic growth, internet use, quality of government, and democracy. Also, we find that an increase in economic growth and quality of governance contribute to reducing corruption in these 65 developed and developing countries. In contrast, an increase in internet use and democracy level raises corruption. The policy implications of the empirical estimations are also discussed in the paper.

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