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The Rainforest Site

The Rainforest Site provides simple, effective, feel-good ways to address an urgent, specific ecological need: the preservation of the world's rainforests. Land preservation, made possible by funds raised at The Rainforest Site, is paid for by site sponsors and carried out by The Nature Conservancy and World Land Trust-US. These organizations work to preserve rainforest land in many locations worldwide.

They have many good petitions that you can take action on.