I've found some places that are more related to your discussions than a sailing forum.

http://www.topix.net/forum/news/global-warming

http://www.theenvironmentsite.org/Forum/index.php?c=8

http://www.coolantarctica.com/Vforum/forumdisplay.php?f=14

If these don't work out I can try to find a few more....