350.org
Bay Area Climate Change
#5 Top Nonprofit
350.org unites an international movement around the climate solutions that science and justice demand.

Sierra Club
National Climate Change
#6 Top Nonprofit
The Sierra Club's mission is to explore, enjoy, and protect the wild places of the earth; To practice and promote the responsible use of the earth's ecosystems and resources; To educate and enlist humanity to protect and restore the quality…

Climate Protection Campaign
Bay Area Climate Change
#9 Top Nonprofit
The Climate Protection Campaign mission is to create a positive future for our children and all life by inspiring action in response to the climate crisis. They advance practical, science-based solutions for achieving significant greenhouse gas reductions.

League of Conservation Voters
National Climate Change
#10 Top Nonprofit
The League of Conservation Voters' mission is to advocate for sound environmental policies and to elect pro-environmental candidates who will adopt and implement such policies.

Center for Biological Diversity
Bay Area Climate Change
#10 Top Nonprofit
The Center for Biological Diversity believes that the welfare of human beings is deeply linked to nature — to the existence in the world of a vast diversity of wild animals and plants. Because diversity has intrinsic value, and because its loss impoverishes society, they work…

The Energy Foundation
Bay Area Climate Change
#11 Top Nonprofit
The Energy Foundation is a partnership of major donors interested in solving the world's energy problems. Their mission is to advance energy efficiency and renewable energy — new technologies that are essential components of a clean energy future.

ClimateWorks Foundation
Bay Area Climate Change
#12 Top Nonprofit
ClimateWorks is an international philanthropic network dedicated to achieving low-carbon prosperity.

Greenpeace
National Climate Change
#14 Top Nonprofit
Greenpeace's mission is to expose global environmental problems, ensure that the Earth is able to nurture life in all its diversity and promote solutions for future generations. Greenpeace, Inc. is the leading independent campaigning organization that uses peaceful direct action…

1Sky
National Climate Change
#15 Top Nonprofit
1Sky's goal is to build a diverse, society-wide mobilization that will convince the US federal government to take bold action by 2010. To identify the steps that US leaders need to take in order to shift the US away from…

Acterra: Action for a Sustainable Earth
Bay Area Climate Change
#15 Top Nonprofit
To bring people together to create local solutions for a healthy planet.