Reducing inequality within and between countries is central to Sustainable Development Goal 10 (SDG 10). Climate change worsens existing disparities through unequal carbon footprints. High-income groups contribute a large share of global emissions, while low-income populations face heavier environmental and social burdens. Although mitigation policies are essential for reducing emissions, their distributional effects within countries remain unclear. This study examines whether and how climate mitigation policies influence within-country carbon inequality worldwide. We use panel data for 166 countries and territories from 2000 to 2019. The analysis combines the Climate Change Laws of the World database with carbon-footprint inequality indicators from the World Inequality Database. Domestic emission disparities are measured by the carbon-footprint Gini coefficient, which reflects how unequally emissions are distributed across income groups. We analyze the cumulative stock of climate mitigation policies rather than individual instruments to capture sustained policy efforts and their variation across policy types, governance capacity, decarbonization pressures, and trade-related spillovers. The results show that mitigation policies generally reduce within-country carbon inequality. Executive and strategic measures have the strongest effects, especially in the energy and transport sectors. The impact is greater in countries with stronger governance and higher decarbonization pressure. Policies in exporting countries also reduce inequality in importers through cleaner trade linkages. These findings suggest that integrating social equity considerations into climate governance can enhance both fairness and policy effectiveness.
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