The following web sites are good sources of additional research and information on public policy for global climate change:
Centre for Policy Research (Environmental Law and Governance research area)
Climate-L News, a listserv maintained by the International Institute for Sustainable Development and an excellent source of news about climate-change research, events, and negotiations. One can subscribe to the list or read recent updates here.
Ecofys: Ecofys is a research consultancy focusing on energy and climate. The "Publications" and "News" sections of its web site have publicly-available information and reports on climate policy.
Evidence for Action on Energy Efficiency (E2e; based at Haas School of Business, University of California, Berkeley)
Grantham Research Institute on Climate Change and the Environment, London School of Economics
IISD Reporting Services: IISD Reporting provides nearly-real-time web-based and video coverage of UNFCCC (see below) negotiating sessions.
Intergovernmental Panel on Climate Change (IPCC): Working Groups II and III ("Impacts, Adaptation and Vulnerability" and "Mitigation," respectively) each deal in part with policy.
International Carbon Action Partnership (ICAP), presenting recently-updated data on carbon markets, including an interactive global map of regional, national, and sub-national emissions trading systems.
International Emissions Trading Association (IETA): IETA is a business association with an interest in promoting emissions trading. It provides useful reports and news on the development and operation of market-based mechanisms to reduce greenhouse-gas emissions.
International Energy Agency ("Climate Change" portion of web site)
Joint Program on the Science and Policy of Global Change, Massachusetts Institute of Technology
Organisation for Economic Cooperation and Development ("Climate Change" portion of web site)
Resources for the Future ("Climate" research area)
United Nations Framework Convention on Climate Change (UNFCCC): The UNFCCC, with the associated Kyoto Protocol, is the primary international treaty addressing climate change. This site provides background and information on negotiations hosted by the Convention and its Secretariat.
World Bank ("Climate Change" portion of web site)