Use search engines that contribute to charity. Ecosia and Goodsearch are two of them.

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Here are some reviews

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The Hunger Site

http://www.freerice.com/   click on the correct meaning of words and they donate rice.  

Ecology fund

http://ecologyfund.com/ecology/_ecology.html   rainforest, pollution, etc.

Care2 

http://www.care2.com/click-to-donate/    the usual, clock to donate

http://www.bhookh.com/   Feed a child in India