Cross Breeds - What are some of those websites that have you click to save the rainforest, animals, etc.?

What are some of those websites that have you click to save the rainforest, animals, etc.?

Like.... click and you will save one yard of the rainforest, etc.?

http://www.thehungersite.com This site gives food to the hunger and on the site there are also links to click to save animals, promote literacy, save the rainforest, help give mammograms for breast cancer, and give health care to children. Edit: also www.jogogreen.com plants a tree for every 10 correct answers you give about the environment. And www.freerice.com donates 20 grains of rice to hungry people for every vocabulary question you answer.