Stop Global Warming (Popularity: )
http://www.wild-again.org Buy deforested land, help it regenerate, and protect it from exploitation again forever. You can do something about global warming ...
Fauna and Flora International (Popularity: )
http://www.fauna-flora.org/ Supports international conservation activities. Documents on methodology, working with NGOs, governments, communities; news, publications, photo gallery.
Species 2000 (Popularity: )
http://www.sp2000.org/ Project to provide indexing and links for all known species as the baseline dataset for studies of global biodiversity.