Income Thresholds and Distributional Effects in African Carbon Pricing: A Multi-Method Approach Toward Climate Resilient and Sustainable Society

Environmental tax effectiveness in Africa is neither universal nor linear. It operates only above a critical income threshold, technology adoption paradoxically raises rather than reduces emissions, and policy responsiveness varies so dramatically across countries and emission levels that uniform regional frameworks prove inadequate. Drawing on panel data from 18 African nations over 2000–2020, this study deploys complementary multi-method estimation to capture structural breaks, cross-national heterogeneity, and distributional variation in emissions dynamics. The results establish that carbon pricing generates meaningful emission reductions exclusively among economies surpassing an identifiable GDP per capita threshold, where institutional prerequisites for effective tax enforcement are sufficiently developed. Technological adoption consistently increases emissions across the sample, driven by dependence on imported carbon-intensive industrial equipment, weak indigenous innovation systems, and inadequate complementary infrastructure rather than green technological progress. Urbanization, by contrast, emerges as a robust and broadly effective mitigation lever, with emission-reducing effects that deepen as urban systems mature. Biodiversity conservation demonstrates the most consistent suppressive effect on emissions across all estimation approaches and country contexts. These findings collectively call for differentiated policy frameworks calibrated to national income levels, institutional capacity, and emission profiles rather than continent-wide prescriptions.