C40 Large Cities — Climate Leadership Group, a network of the world’s largest municipalities committed to sharing information and working together, supported by the Clinton Climate Initiative.
Carbonn Cities Climate Registry, an online service that helps cities and local governments to measure, report and verify their measures to reduce greenhouse gas emissions.
Climate Protection Center, U.S. Conference of Mayors’ information center on best practices, grants and events related to the 2005 U.S. Conference of Mayors Climate Protection Agreement.
Earth Day Network, a nongovernmental group devoted to educating youth and the general public around the world about environmental issues.
ICLEI – Local Governments for Sustainability, an association of more than 1,220 local governments from 70 countries that are committed to environmentally sustainable development.
International NRG Battle, an industry-sponsored international student competition for solutions to energy and climate problems.
Regions of Climate Action (R20), an international nongovernmental group that works on low-carbon and climate-resilient projects through cooperation among local governments and other parties.
World Mayors Council on Climate Change, an alliance of more than 50 local government leaders advocating involvement in efforts to address climate change and related issues.