Do you use Yahoo as your search engine and would you like to help the environment? If yes then Ecocho is for you. It is a search engine that uses Yahoo’s search technology and advertising so that they can afford to plant two trees for every 1000 searches. It seems like a fine venture similar to the freerice site. Also if you are the type of person who does all their searches in the search box in upper right part of your browser they offer a plug-in so you can use the service. If you would like to green up your searches then give this one a try.