[RickOShay]

If you read their FAQ page it explains it a little more, but from I think by buying those cards you are basically investing/contributing in CDM (Clean Development Mechanism) projects (projects that help to reduce emissions in developing countries). If you wanna know more about CDM's and the Kyoto Protocol I suggest researching on wiki. That's what I did cuz I had no idea what the hect a CDM was.