In recognition of the urgency of reducing methane emissions, several voluntary international multiparty agreements and initiatives have recently been concluded to accelerate collective action and establish formal mechanisms for monitoring the implementation of methane-related commitments. While these initiatives reflect ambition on the part of public, private, and civil society actors with regard to methane, the implementation of these initiatives presents challenges for governments, emitting sectors, and other parties.

This volume of briefs examines subnational climate-change policy in China — including how Chinese provinces and municipalities work with the central government to implement policy. The volume focuses to a considerable degree on how China’s subnational (pilot) emissions-trading systems can inform the emerging national carbon-pricing system.

The Harvard Project has released a paper on China-U.S. cooperation on climate-change policy—jointly authored with researchers at China's National Center for Climate Change Strategy and International Cooperation.

The introduction of the U.S. SO2 allowance-trading program to address the threat of acid rain as part of the Clean Air Act Amendments of 1990 is a landmark event in the history of environmental regulation. The program was a great success by almost all measures. Ironically, cap and trade seems especially well suited to addressing the problem of climate change, in that emitted greenhouse gases are evenly distributed throughout the world's atmosphere. Recent hostility toward cap and trade in debates about U.S. climate legislation may reflect the broader political environment of the climate debate more than the substantive merits of market-based regulation.