Alex from WorldChanging sez, "We weren't satisfied with the bogus "green" graduation gifts being hawked out there, so we decided to create the ultimate one. For a gift of $6,000, we'll offset the climate emissions of your favorite high school grad's whole childhood, giving them a carbon clean slate. It's only $7,500 for a college graduate. Expensive? No, discounted. The point is our impacts are much to big to change with some hemp sandals or a solar backpack, and it'