Since 1970, transportation, power generation, and manufacturing have dramatically transformed as air pollutant emissions have fallen significantly. To evaluate the causal impacts of the Clean Air Act on these changes, we synthesize and review retrospective analyses of air quality regulations....

A natural outcome of the emerging pledge and review approach to international climate change policy is interest in comparing mitigation effort among countries. Domestic publics and stakeholders will have an interest in knowing if peer countries are undertaking (or planning to undertake)...

The comparability of domestic actions to mitigate global climate change has important implications for the stability, equity, and efficiency of international climate agreements. We examine a variety of metrics that could be used to evaluate countries' climate change mitigation effort and...