350.org
An international campaign dedicated to building a movement to unite the world around solutions to the climate crisis--the solutions that justice demand.

Center for a New American Dream
Challenges individuals to establish climate-friendly daily habits and inspire their friends to do the same.

Ceres
National network of investors, environmental organizations, and other public interest groups working with companies and investors to address sustainability challenges, including climate change.

Clean Water Action
Major national environmental advocacy and protection organization.

Energy Justice Network
Grassroots energy agenda, supporting communities threatened by polluting energy and waste technologies

Environment Massachusetts
A statewide, citizen-based environmental advocacy organization and the new home of MASSPIRG's environmental work – learn about environmental advocacy going on right now in Massachusetts.

Green America: Climate Action
Provides tools to take economic action to stop global warming.

ICLEI: Local Governments for Sustainability
International association of local, national and regional local governments that have made a commitment to sustainable development.

MassRecycle
Statewide coalition of individuals, governments, businesses, institutions, and non-profit organizations dedicated promoting the value of reducing, reusing, and recycling waste products, and of using recycled products.

U.S. Climate Action Network
The largest US network of organizations focused on climate change. The only network connecting organizations working on climate advocacy and policy development at all three levels of the debate: state/regional, federal, and international. USCAN is an affiliate network of the Climate Action Network, a worldwide network of more than 400 Non-Governmental Organizations from 85 countries working to promote government, private sector and individual action to limit human-induced climate change to ecologically sustainable levels.