Climate change mitigation is a public good requires international cooperation and collective actions. This dissertation consists of three essays that focus on European and American public attitudes toward climate change mitigation. The first essay examines regional differences in public support for climate policies and identifies the determinants, which include individual and regional factors. The second essay examines the existence of an environmental belief-action gap and its impact on the subjective well-being of individuals. The third essay examines how the environmental effectiveness, labor market impacts, and revenue distribution attribute associated with climate strategies foster public support. These essays highlight the importance of understanding the public acceptability of climate policies and promoting pro-environmental behaviors in climate change mitigation.