Quite a ways back I posted about a great site called Freerice. It is a game site that when played earns rice to be donated to others in need. Now TreeWala is almost exactly the same concept but for trees. We all need more trees. All you do is answer questions, mostly vocab and a couple of sciencey ones, to gain leaves. For every correct answer you get one leaf and for every twenty leaves one tree will be planted. It all works through ad revenue and a co-op between the site and the Marion institute. It is one of those simple games that you can play guilt free. I mean first and foremost it is educational and second it is doing something beneficial for the planet. If you are a word buff or just trying to be green, give this a try.
Note: Yesterday I was in the lab and saw a patron using FreeRice. I asked her if she knew about TreeWala and she said she knew nothing about it but her English teacher (ESL) was making her do it to improve her vocabulary. Now I don't want to be geekier than normal but I think that is AWESOME!