If you go to the website, it explains...but basically, they have sponsors who have agreed to donate money for each click, and in turn they get their ad banner atop of the donation page. It's the same format with thehungersite.com and thebreastcancersite.com...so basically the more people that go each day to click (you're limited to one click per day) the more money the sponsor will donate to purchase rainforest land!
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