Abstract
Carbon dioxide (CO2) is the most prevalent greenhouse gas that triggers climate change, which in turn leads to catastrophic effects on trade, business, human health, and other areas. Understanding the characteristics and tendency of CO2 emissions will improve policy making and mitigation strategies. Understanding the linearity or nonlinearity and convergence or divergence of CO2 emissions is essential for selecting appropriate modeling techniques and for designing reliable policies. Therefore, this paper investigates the nonlinearity and nonlinear convergence of CO2 emissions among the world’s top 20 highest emitting countries, which account for 80% of the world’s total emissions. To check the nonlinearity of CO2 emissions, the McLeod–Li nonlinearity test, the Terasvirta nonlinearity test, and the Brock–Dechert–Scheinkman–LeBaron nonlinearity test are employed. The convergence or divergence of CO2 emissions is checked by using the Kilic nonlinear unit root test, the Hu and Chen nonlinear unit root test, and the Park and Shintani nonlinear unit root test. The findings revealed that the CO2 emissions process in all the 20 countries is nonlinear; 17 countries exhibit convergence in CO2 emissions while the other 3 countries diverged from 1960 to 2018. Based on the results, the nonlinear nature of CO2 emissions requires special attention from scholars when selecting estimation techniques for CO2 emissions. For countries with convergence, emissions trends can be used to forecast future values of CO2 emissions. Moreover, strong policy actions are required to achieve convergence in the countries with divergence.
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Ali Sohail was involved in conceptualization, formal analysis, methodology, investigation, writing—original draft preparation and visualization. Jinfeng Du helped in formal analysis, supervision, writing—review and editing. Babar Nawaz Abbasi contributed to data curation, software and formal analysis. Zahoor Ahmed was involved in writing—review and editing, validation. All authors read and approved the final manuscript.
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Sohail, A., Du, J., Abbasi, B.N. et al. The nonlinearity and nonlinear convergence of CO2 emissions: Evidence from top 20 highest emitting countries. Environ Sci Pollut Res 29, 59466–59482 (2022). https://doi.org/10.1007/s11356-022-19470-x
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DOI: https://doi.org/10.1007/s11356-022-19470-x