For those that have Facebook and/or MySpace, the "Lil Green Patch" and "Lil Blue Cove" help save square feet of rainforest!

It works like this:

The advertisers on these web pages essentially pay for the rainforest saved. All you have to do is send plants (for green patch) and fish (for blue cove) to friends, and for every 10 friends you send to, you save 1 sq.ft. You can invite 20 people with Lil Green Patch and 20 with Lil Blue Cove, so that adds up to 4 sq.ft. per day!

It takes about 2 minutes, and it's definitely worth it.