Save the worlds rainforests a search at a time with Ecosia. (via blankbullet.com- link deprecated)
update: Lee in comments to this post said Ecosia is a scam(see update 3). I’ve had a look at this (see article here and here). It seems Ecosia is a for profit organisation but looks quite legitimate and worthwhile to use. It is always worth checking these things out however, and there are plenty of other search engines out there which do much the same thing. eg. Ecosearch, Goodsearch, to name just two which we could all look at and utilise.
update 2: Read the comments to this post before you do anything else! There are plenty of big questions surrounding Ecosia once you start to look at them and as to whether its the sort of business you would want to support. Look carefully into these environmental search engines and if in doubt don’t use them. The best advice may be to make a donation to a good charity instead. WWF.
update 3: Christian the founder of Ecosia has posted a comment below and also a reference from the WWF has been found. This all taken together means that using Ecosia to do your online searching will make a contribution and seems to be totally legitimate.