Abstract
Driven by the increasing level of environmental degradation in developing countries, especially Nigeria, and the conflicting empirical results, this study investigates the impact of economic growth, natural resources, urbanization, human capital, financial development, foreign direct investment, and trade openness on the ecological footprint (EFP) in Nigeria between 1970 and 2017. The study accounts for structural breaks in the data using the Zivot–Andrews unit root method along with other conventional unit root tests. Autoregressive Distributive Lag (ARDL) and Granger causality estimation techniques are used to determine the short- and long-run effect as well as the causal direction between the variables. The outcomes of the study suggest that economic growth, foreign direct investment, and trade openness contribute positively to EFP, hence worsening environmental quality. However, urbanization, financial development, natural resources, and human capital abate the EFP in Nigeria. The findings from the granger causality test reveal a unidirectional causality from economic growth, foreign direct investment, and trade openness to EFP; while bidirectional causality exists between natural resources and EFP; and urbanization and EFP. The results are robust to different estimation techniques. Lastly, measures to ensure environmental sustainability in the context of Nigeria are suggested.
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04 July 2023
A Correction to this paper has been published: https://doi.org/10.1007/s10818-023-09337-7
References
Abid, M. (2016). Impact of economic, financial, and institutional factors on CO2 emissions: Evidence from Sub-Saharan Africa economies. Utilities Policy, 41, 85–94.
Ahmed, Z., & Wang, Z. (2019). Investigating the impact of human capital on the EFP in India: An empirical analysis. Environmental Science and Pollution Research, 26(26), 26782–26796.
Ahmed, K. (2014). Environmental Kuznets curve for CO2 emission in Mongolia: An empirical analysis. Management of Environmental Quality. An International Journal, 25(4), 505–516.
Ahmed, Z., Zhang, B., & Cary, M. (2021). Linking economic globalization, economic growth, financial development, and EFP: Evidence from symmetric and asymmetric ARDL. Ecological Indicators, 121, 160.
Ahmed, Z., Asghar, M. M., Malik, M. N., & Nawaz, K. (2020a). Moving towards a sustainable environment: The dynamic linkage between natural resources, human capital, urbanization, economic growth, and EFP in China. Resources Policy, 67, 101677. https://doi.org/10.1016/j.resourpol.2020.101677
Ahmed, Z., Zafar, M. W., & Ali, S. (2020b). Linking urbanization, human capital, and the EFP in G7 countries: An empirical analysis. Sustainable Cities and Society, 55, 102064.
Ahmed, Z., Zafar, M. W., & Mansoor, S. (2020c). Analyzing the linkage between military spending, economic growth, and EFP in Pakistan: Evidence from cointegration and bootstrap causality. Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-020-10076-9
Ahmed, Z., Nathaniel, S. P., & Shahbaz, M. (2021). The criticality of information and communication technology and human capital in environmental sustainability: Evidence from Latin American and Caribbean countries. Journal of Cleaner Production, 286, 125529. https://doi.org/10.1016/j.jclepro.2020.125529
Ahmed, Z., Wang, Z., & Ali, S. (2019). Investigating the non-linear relationship between urbanization and CO2 emissions: An empirical analysis. Air Qual. Atmos. Heal., 12, 945–953. https://doi.org/10.1007/s11869-019-00711-x
Akinlo, T., & Dada, J. T. (2021). The moderating effect of foreign direct investment on environmental degradation-poverty reduction nexus: Evidence from Sub-Sharan African Countries. Environment, Development and Sustainability, 23(2), 15764–15784. https://doi.org/10.1007/s10668-021-01315-1
Al-Mulali, U., Weng-Wai, C., Sheau-Ting, L., & Mohammed, A. H. (2015). Investigating the environmental Kuznets curve (EKC) hypothesis by utilizing the EFP as an indicator of environmental degradation. Ecological Indicators, 48, 315–323.
Alola, A. A., Bekun, F. V., & Sarkodie, S. A. (2019). Dynamic impact of trade policy, economic growth, fertility rate, renewable and non-renewable energy consumption on EFP in Europe. The Science of the Total Environment, 685, 702–709. https://doi.org/10.1016/j.scitotenv.2019.05.139
Aluko, O. A., & Ibrahim, M. (2020). Institutions and the financial development–economic growth nexus in sub-Saharan Africa. Economic Notes. https://doi.org/10.1111/ecno.12163
Aydin, M., & Turan, Y. E. (2020). The influence of financial openness, trade openness, and energy intensity on EFP: Revisiting the environmental Kuznets curve hypothesis for BRICS countries. Environmental Science and Pollution Research, 27(34), 43233–43245.
Babayemi, J. O., Ogundiran, M. B., & Osibanjo, O. (2016). Overview of environmental hazards and health effects of pollution in developing countries: A case study of Nigeria. Environmental Quality Management, 26(1), 51–71.
Baek, J., Cho, Y., & Koo, W. W. (2009). The environmental consequences of globalization: A country-specific time-series analysis. Ecological Economics, 68, 2255–2264.
Baloch, M. A., Zhang, J., Iqbal, K., & Iqbal, Z. (2018). The effect of financial development on EFP in BRI countries: Evidence from panel data estimation. Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-018-3992-9
Baloch, M. A., Zhang, J., Iqbal, K., & Iqbal, Z. (2019). The effect of financial development on EFP in BRI countries: Evidence from panel data estimation. Environmental Science and Pollution Research, 26(6), 6199–6208. https://doi.org/10.1007/s11356-018-3992-9
Balsalobre-lorente, D., Shahbaz, M., Roubaud, D., & Farhani, S. (2018). How economic growth, renewable electricity and natural resources contribute to CO2 emissions? Energy Policy, 113(1), 356–367. https://doi.org/10.1016/j.enpol.2017.10.050
Bekun, F. V., Alola, A. A., & Sarkodie, S. A. (2019). Toward a sustainable environment: Nexus between CO2 emissions, resource rent, renewable and nonrenewable energy in 16-EU countries. Science of the Total Environment, 657, 1023–1029. https://doi.org/10.1016/j.scitotenv.2018.12.104
Bello, A. K., & Abimbola, O. M. (2010). Does the level of economic growth influence environmental quality in Nigeria: A test of environmental Kuznets curve (EKC) hypothesis. Pakistan Journal of Social Sciences, 7(4), 325–329.
Charfeddine, L., & Mrabet, Z. (2017). The impact of economic development and social-political factors on EFP: A panel data analysis for 15 MENA countries. Renewable and Sustainable Energy Reviews, 76, 138–154. https://doi.org/10.1016/j.rser.2017.03.031
Charfeddine, L. (2017). The impact of energy consumption and economic development on EFP and CO2 emissions: Evidence from a Markov switching equilibrium correction model. Energy Economics, 65, 355–374. https://doi.org/10.1016/j.eneco.2017.05.009
Chen, H., Hao, Y., Li, J., & Song, X. (2018). The impact of environmental regulation, shadow economy, and corruption on environmental quality: Theory and empirical evidence from China. Journal of Cleaner Production. https://doi.org/10.1016/j.jclepro.2018.05.206
Dada, J. T., & Abanikanda, E. O. (2019). How important is oil revenue in Nigerian growth process? Evidence from a threshold regression. International Journal of Sustainable Economy, 11(4), 364–377. https://doi.org/10.1504/IJSE.2019.10025140
Dada, J. T., & Abanikanda, E. O. (2021a). The moderating effect of institutions in foreign direct investment led growth hypothesis in Nigeria. Economic Change and Restructuring. https://doi.org/10.1007/s10644-021-09332-w
Dada, J. T., & Ajide, F. M. (2021b). The moderating role of institutional quality in shadow economy-pollution nexus in Nigeria. Management of Environmental Quality: An International Journal, 32(3), 506–523. https://doi.org/10.1108/MEQ-10-2020-0238
Dada, J. T., & Akinlo, T. (2021). Foreign direct investment and poverty reduction in Sub-Saharan Africa: Does environmental degradation matter? Future Business Journal, 7(21), 100. https://doi.org/10.1186/s43093-021-00068-7
Dada, J. T., Ajide, F. M., & Adeiza, A. (2021). Shadow economy and environmental pollution in West African countries: The role of institutions. Global Journal of Emerging Market Economics. https://doi.org/10.1177/09749101211049038
Dada, J. T., Ajide, F. M., & Sharimakin, A. (2021b). Shadow economy, institutions and environmental pollution: Insights from Africa. World Journal of Science, Technology and Sustainable Development, 18(2), 153–171. https://doi.org/10.1108/WJSTSD-12-2020-0105
Dada, J. T. (2019). Energy generation and industrial output in Nigeria. Indian Journal of Economics, 100(396), 33–44.
Dada, J. T., & Fanowopo, O. (2020). Economic growth and poverty reduction: The role of institutions. Ilorin Journal of Economic Policy, 7(1), 1–15.
Danish, Hassan, S. T., Baloch, M. A., Mehmood, N., & Zhang, J. (2019). Linking economic growth and EFP through human capital and biocapacity. Sustainable Cities and Society. https://doi.org/10.1016/j.scs.2019.101516
Danish, Ulucak, R., Khan, S.U-Din. (2019). Determinants of the EFP: Role of renewable energy, natural resources, and urbanization. Sustainable Cities and Society. https://doi.org/10.1016/j.scs.2019.101996
Dhrifi, A., Jaziri, R., & Alnahdi, S. (2019). Does foreign direct investment and environmental degradation matter for poverty? Evidence from developing countries. Structural Change and Economic Dynamics. https://doi.org/10.1016/j.strueco.2019.09.008
Du, L., Wei, C., & Cai, S. (2012). Economic development and carbon dioxide emissions in China: Provincial panel data analysis. China Economic Review, 23(2), 371–384.
Esteller, M. V., Domínguez-Mariani, E., Garrido, S. E., & Aviles, M. (2015). Groundwater pollution by arsenic and other toxic elements in an abandoned silver mine, Mexico. Environmental Earth Sciences, 74, 2893–2906. https://doi.org/10.1007/s12665-015-4315-9
Fabiyi, R. O., & Dada, J. T. (2017). Fiscal Deficit and Sectoral Output in Nigeria. American Journal of Social Sciences, 5(6), 41–46.
Fakher, H. A. (2019). Investigating the determinant factors of environmental quality (based on ecological carbon footprint index). Environmental Science and Pollution Research, 26(10), 10276–10291.
GFN. (2019). Global Footprint Network. Retrieved from http://data.footprintnetwork.org/#/countryTrends?type=BCtot,EFCtot&cn=165
Gorus, M. S., & Aydin, M. (2019). The relationship between energy consumption, economic growth, and CO2 emission in MENA countries: Causality analysis in the frequency domain. Energy, 168, 815–822.
Hanif, I. (2018). Impact of economic growth, nonrenewable and renewable energy consumption, and urbanization on carbon emissions in Sub-Saharan Africa. Environmental Science and Pollution Research, 25(15), 15057–15067.
Harris, R., & Sollis, R. (2003). Applied time series modelling and forecasting. Wiley.
Hassan, S. T., Xia, E., Khan, N. H., & Shah, S. M. A. (2018). Economic growth, natural resources, and EFPs: Evidence from Pakistan. Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-018-3803-3
He, F. S., Goh, G., Gan, G., Al-Mulali, U., & Adebola, S. S. (2019). The influences of economic indicators on environmental pollution in Malaysia. International Journal of Energy and Economics Policy, 9(2), 123–131. https://doi.org/10.32479/ijeep.7489
Huynh, C. M., & Ho, T. X. (2020). Institutional quality, shadow economy and air pollution: Empirical insights from developing countries. The Empirical Economics Letters, 19(1), 75–82.
Ibrahiem, D. M., & Hanafy, S. A. (2020). Dynamic linkages amongst EFPs, fossil fuel energy consumption and globalization: An empirical analysis. Management of Environmental Quality: An International Journal, 28(7), 1–21. https://doi.org/10.1007/s11356-020-11576-4
Ibrahim, M. H., & Law, S. H. (2016). Institutional quality and CO2 emissions-trade relations: Evidence from sub-Saharan Africa. South African Journal of Economics, 84(2), 323–340.
Iorember, P. T., Goshit, G. G., & Dabwor, D. T. (2020). Testing the nexus between renewable energy consumption and environmental quality in Nigeria: The role of broad-based financial development. African Development Review, 32(2), 163–175.
Katircioglu, S. (2017). Investigating the role of oil prices in the conventional EKC model: Evidence from turkey. Asian Economic and Financial Review, 7(5), 498–550.
Katircioglu, S., & Katircioglu, S. (2018). Testing the role of urban development in the conventional environmental Kuznets curve: Evidence from Turkey. Applied Economics Letters, 25(11), 741–746.
Katircioglu, S., Gokmenoglu, K. K., & Eren, B. M. (2018). Testing the role of tourism development in EFP quality: Evidence from top 10 tourist destinations. Environmental Science and Pollution Research, 25(33), 33611–33619.
Kaya, Y., & Yokoburi, K. (1997). Environment, energy, and economy: Strategies for sustainability. United Nations University Press.
Kihombo, S., Ahmed, Z., Chen, S., Adebayo, T. S., & Kirikkaleli, D. (2021a). Linking financial development, economic growth, and EFP: What is the role of technological innovation? Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-021-14993-1
Kihombo, S., Saud, S., Ahmed, Z., & Chen, S. (2021b). The effects of research and development and financial development on CO2 emissions : Evidence from selected WAME economies. Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-021-14288-5
Kivyiro, P., & Arminen, H. (2014). Carbon dioxide emissions, energy consumption, economic growth, and foreign direct investment: Causality analysis for Sub-Saharan Africa. Energy, 74, 595–606.
Köksal, C., Işik, M., & Katircioğlu, S. (2020). The role of shadow economies in EFP quality: Empirical evidence from Turkey. Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-020-07956-5
Kongbuamai, N., Bui, Q., Yousaf, H. M. A. U., & Liu, Y. (2020). The impact of tourism and natural resources on the EFP: A case study of ASEAN countries. Environmental Science and Pollution Research, 27(16), 19251–19264.
Lau, L. S., Choong, C. K., & Eng, Y. K. (2014). Investigation of the environmental Kuznets curve for carbon emissions in Malaysia: Do foreign direct investment and trade matter? Energy Policy, 68, 490–497.
Le, T., Chang, Y., & Park, D. (2016). Trade openness and environmental quality: International evidence. Energy Policy, 92, 45–55.
Li, P. (2018). Mine water problems and solutions in China. Mine Water and the Environment, 37, 217–221. https://doi.org/10.1007/s10230-018-0543-z
Lin, X., Zhao, Y., Ahmad, M., Ahmed, Z., Rjoub, H., & Adebayo, T. S. (2021). Linking innovative human capital, economic growth, and CO2 emissions: An empirical study based on Chinese Provincial Panel Data. International Journal of Environmental Research and Public Health. https://doi.org/10.3390/ijerph18168503
Liu, L., & Le, Y. (2020). Dynamic changes of the EFP in the Beijing-Tianjin-Hebei region from 1996 to 2020. Ecological Indicators, 112, 106142.
Maji, I. K. (2017). The link between trade openness and deforestation for environmental quality in Nigeria. GeoJournal, 82(1), 131–138.
Mrabet, Z., & Alsamara, M. (2017). Testing the Kuznets curve hypothesis for Qatar: A comparison between carbon dioxide and ecological footprint. Renewable and Sustainable Energy Reviews, 70, 1366–1375.
Mrabet, Z., Alsamara, M., & Hezam Jarallah, S. (2017). The impact of economic development on environmental degradation in Qatar. Environmental and Ecological Statistics, 24, 7–38.
Nathaniel, S., & Khan, S. A. R. (2020). The nexus between urbanization, renewable energy, trade, and EFP in ASEAN countries. Journal of Cleaner Production, 272, 122709.
Nathaniel, S., Anyanwu, O., & Shah, M. (2020a). Renewable energy, urbanization, and EFP in the Middle East and North Africa region. Environmental Science and Pollution Research, 27, 14601–14613. https://doi.org/10.1007/s11356-020-08017-7
Nathaniel, S., Nwodo, O., Sharma, G., & Shah, M. (2020b). Renewable energy, urbanization, and ecological footprint linkage in CIVETS. Environmental Science and Pollution Research, 27(16), 19616–19629.
Nathaniel, S., Nwodo, O., Adediran, A., Sharma, G., Shah, M., & Adeleye, N., (2019). EFP, urbanization, and energy consumption in South Africa: including the excluded. Environ. Sci. Pollut. Control Ser. 1e12.
Nathaniel, S. P. (2020). EFP, energy use, trade, and urbanization linkage in Indonesia. GeoJournal. https://doi.org/10.1007/s10708-020-10175-7
Nathaniel, S. P., & Bekun, F. V. (2020). Electricity consumption, urbanization, and economic growth in Nigeria: new insights from combined cointegration amidst structural breaks. Journal of Public Affairs, 21(1), e2102.
Nathaniel, S. P., Barua, S., & Ahmed, Z. (2021). What drives EFP in top ten tourist destinations? Evidence from advanced panel techniques. Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-021-13389-5
Olaniyi, C. O., & Oladeji, S. I. (2020). Symmetric and asymmetric effects of financial development on carbon dioxide emissions in Nigeria: Evidence from linear and nonlinear autoregressive distributed lag analyses. Economic Change and Restructuring. https://doi.org/10.1007/s10644-020-09275-8
Omoke, P. C., Opuala-Charles, S., & Nwani, C. (2020). Symmetric and asymmetric effects of financial development on carbon dioxide emissions in Nigeria: Evidence from linear and nonlinear autoregressive distributed lag analyses. Energy Exploration & Exploitation, 38(5), 2059–2078.
Ouattara, B. (2004). Modelling the long-run determinants of private investment in Senegal. Cent. Res. Econ. Dev. Int. Trade 37
Ozcan, B., Apergis, N., & Shahbaz, M. (2018). A revisit of the environmental Kuznets curve hypothesis for Turkey: New evidence from bootstrap rolling window causality. Environmental Science and Pollution Research, 25(32), 32381–32394.
Park, Y., Meng, F., & Baloch, M. A. (2018). The effect of ICT, financial development, growth, and trade openness onCO2 emissions: An empirical analysis. Environmental Science and Pollution Research, 25, 30708–30719. https://doi.org/10.1007/s11356-018-3108-6
Pesaran, M. H., Shin, Y., & Smith, R. J. (2001). Bounds testing approaches to the analysis of level relationships. Journal of Applied Economics, 16(3), 289–326. https://doi.org/10.1002/jae.616
Rees, W. E. (1992). EFPs and appropriated carrying capacity: What urban economics leaves out”. Environment and Urbanization, 4(2), 121–130. https://doi.org/10.1177/095624789200400212
Sarkodie, S. A., & Ozturk, I. (2020). Investigating the environmental Kuznets curve hypothesis in Kenya: a multivariate analysis. Renewable Sustainable Energy Reviews, 117, 1481.
Shahbaz, M., Haouas, I., & Van Hoang, T. H. (2019). Economic growth and environmental degradation in Vietnam: Is the environmental Kuznets curve a complete picture? Emerging Markets Review, 38, 197–218.
Shahbaz, M., Hye, Q. M. A., Tiwari, A. K., & Leitão, N. C. (2013). Economic growth, energy consumption, financial development, international trade and CO2 emissions in Indonesia. Renewable & Sustainable Energy Reviews, 25, 109–121. https://doi.org/10.1016/j.rser.2013.04.009
Shahzad, U., Fareed, Z., Shahzad, F., & Shahzad, K. (2021). Investigating the nexus between economic complexity, energy consumption and EFP for the United States: New insights from quantile methods. Journal of Cleaner Production, 279, 123806.
Solarin, S. A., & Al-mulali, U. (2018). Influence of foreign direct investment on indicators of environmental degradation. Environmental Science and Pollution Research, 25(25), 24845–24859. https://doi.org/10.1007/s11356-018-2562-5
Solarin, S. A., Tiwari, A. K., & Bello, M. O. (2019). A multi-country convergence analysis of EFP and its components. Sustainable Cities and Society, 46, 101422. https://doi.org/10.1016/j.scs.2019.101422
Tutulmaz, O. (2015). Environmental Kuznets Curve time-series application for Turkey: Why controversial results exist for similar models? Renewable & Sustainable Energy Reviews, 50, 73–81. https://doi.org/10.1016/j.rser.2015.04.184
Uddin, G. A., Salahuddin, M., Alam, K., & Gow, J. (2017). EFP and real income: Panel data evidence from the 27 highest emitting countries. Ecological Indicators, 77, 166–175. https://doi.org/10.1016/j.ecolind.2017.01.003
Udemba, E. N. (2020). A sustainable study of economic growth and development amidst EFP: New insight from Nigerian Perspective. Science of the Total Environment. https://doi.org/10.1016/j.scitotenv.2020.139270
Ulucak, R., & Bilgili, F. (2018). A reinvestigation of EKC model by EFP measurement for high, middle and low-income countries. Journal of Cleaner Production. https://doi.org/10.1016/j.jclepro.2018.03.191
Wackernagel, M. & Rees, W. (1996). Our EFP. Reducing Human Impact on the Earth, New Society Publishers, Gabriola Island, British Columbia.
Wang, J., & Dong, K. (2019). What drives environmental degradation? Evidence from 14 Sub-Saharan African countries”. The Science of the Total Environment, 656, 165–173. https://doi.org/10.1016/j.scitotenv.2018.11.354
World Bank. (2018). Global Gas Flaring Reduction Partnership (GGFR); Global Gas Flaring Reduction Partnership (GGFR) (worldbank.org)
Xu, Z., Baloch, M. A., Danish, M. F., Zhang, J., & Mahmood, Z. (2018). Nexus between financial development and CO2 emissions in Saudi Arabia: analyzing the role of globalization. Environmental Science and Pollution Research, 25, 28378–28390. https://doi.org/10.1007/s11356-018-2876-3
Xu, P., Zeng, Y., Fong, Q., Lone, T., & Liu, Y. (2012). Chinese consumers’ willingness to pay for green- and eco-labelled seafood. Food Control, 28, 74–82. https://doi.org/10.1016/j.foodcont.2012.04.008
Yilanci, V., & Pata, U. K. (2020). Investigating the EKC hypothesis for China: The role of economic complexity on EFP. Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-020-09434-4
Zafar, M. W., Zaidi, S. A. H., Khan, N. R., Mirza, F. M., Hou, F., & Kirmani, S. A. A. (2019). The impact of natural resources, human capital, and foreign direct investment on the EFP: The case of the United States. Resources Policy, 63, 101428.
Zen, I. S., Noor, Z. Z., & Yusuf, R. O. (2014). The profiles of household solid waste recyclers and non-recyclers in Kuala Lumpur, Malaysia. Habitat International, 42, 83–89. https://doi.org/10.1016/j.habitatint.2013.10.010
Zivot, E., & Andrews, D. W. K. (1992). Further evidence on the great crash, the oil-price shock, and the unit-root hypothesis. J. Bus. Econ. Stat., 10, 251–270.
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Dada, J.T., Adeiza, A., Ismail, N.A. et al. Investigating the link between economic growth, financial development, urbanization, natural resources, human capital, trade openness and ecological footprint: evidence from Nigeria. J Bioecon 24, 153–179 (2022). https://doi.org/10.1007/s10818-021-09323-x
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DOI: https://doi.org/10.1007/s10818-021-09323-x
Keywords
- Ecological footprint
- Economic growth
- Urbanization
- Financial development
- Natural resources
- Human capital
- Nigeria