Here's something you can do anyway, every day - visit the Rainforest site and click on a button, and the advertisers pay for a few feet of rainforest to be preserved.

You can't save the planet on your own, but you can save a few trees. (This is linked up with the hungersite which works on the same basis to buy rice for hungry people.)

Visit them when you log on, and put them on your email signature.