Nonrenewable and renewable energy consumption, trade openness, and environmental quality in G-7 countries: the...

The present study empirically investigates the tripartite impacts of renewable energy (RE), nonrenewable energy (NRE), and trade openness (TO) with the conditioning role of technology on environmental quality (CO₂ emission) for the G-7 countries (Canada, France, Germany, Japan, Italy, USA, and United Kingdom) for the period straddling 1990-2019. The empirical analyses are anchored on a set of estimation procedures including; cross-sectional dependence test, second generation panel unit root test, Westerlund cointegration test, Hausman test, and pooled mean group (PMG). The following results emanate from the findings. First, the presence of cross-sectional dependence and long-run relationships are confirmed for the countries. Second, RE significantly lessens the prevalence of carbon emissions across the estimated models. This further underscores the mitigating effects of RE on CO₂ emissions for the G-7 countries. Third, the impacts of NRE and TO are found to contribute to surge in CO₂ emissions. Fourth, the effects of technological progress captured by research and development (RD) and eco-innovation significantly reduce the stock of CO₂ emissions using both unconditional (single effect) and conditional (interactive effect) methods. Fifth, the existence of Environmental Kuznets Curve (EKC) receives empirical support for the G-7 countries. Other covariates such as foreign direct investment (FDI), Gross Fixed Capital Formation (GCFC), and service value-added (SVA) exert diverging impacts on CO₂ emissions. Sixth, the country-level analyses show the heterogeneous nature of the G-7 countries as evident from each country's findings.