alt.global-warming - join
A discussion of the problem of global warming
Low activity, 851 subscribers, Usenet

globalchange - join
Moderated discussion of environmental science, economics, policy and politics, especially as related to global change issues such as climate change, biodiversity, and sustainability.
Low activity, 420 members, moderated, restricted

sci.environment - join
Discussions about the environment and ecology.
Low activity, 1528 subscribers, Usenet