Bill McKibben is one of the most visible and outspoken proponents of climate change awareness. He manages this site which has world-wide participation.
POST CARBON INSTITUTE
Mission is to assist societies in their efforts to relocalize communities and adapt to an energy constrained world. We believe that production of oil and natural gas will peak soon, climate change is worsening, and the current global economic system is unstable and reinforces huge disparities. Our response is to promote drastically lower consumption, greater local self-reliance, and more cooperative and inclusive communities
The current issue of this vast web site looks at the many aspects of global climate change: the science, the politics and human equality.
UNION OF CONCERNED SCIENTISTS
The website that outlines the advocacy campaigns of the Union of Concerned Scientists. Check out the "Green Tips" e-mail series.
The online edition of Yes! almost always carries news and ideas about climate change, such as the Keystone pipeline and organic farming currently.