The Ruckus Society (Popularity: )
http://www.ruckus.org/ Tree climbing, banner hanging and all manner of Direct Action Training. Committed to making other environmental activists and their campaigns ...
Rainforest Action Network (Popularity: )
http://www.ran.org/ Works to protect the Earth's rainforests and support the rights of their inhabitants through education, grassroots organizing, and non-violent direct ...
Times-Up! (Popularity: )
http://www.times-up.org/ Environmental group in New York City with accent on bicycling and pedestrian rights and activities.