The Great Global Warming Swindle
A well-produced and thought provoking documentary from Britain's Channel Four. You can watch it here at Google Video, and there's also a link for downloading the entire program.
"The other reason that environmental extremism emerged was because world communism failed, the (Berlin) wall came down, and a lot of peaceniks and political activists moved into the environmental movement, bringing their neo-Marxism with them -- and learned to use Green language in a very clever way to cloak agendas that actually have more to do with anti-capitalism and anti-globalization than they do anything with ecology or science." -- Patrick Moore; Co-Founder of GreenPeace
UPDATE:
And in case you still think that the Climate Change debate is about science rather than politics: Scientists threatened for 'climate denial'
"The Green movement has hijacked the issue of climate change. It is ludicrous to suggest the only way to deal with the problem is to start micro managing everyone, which is what environmentalists seem to want to do."