How to Buy Carbon Offsets That Actually Help the Environment
by Tim Donnelly from Lifehacker on (#4ZMHC)

Carbon offsets can seem too good to be true. In theory, the offsets work like a big sponge sopping up all the emissions you put into the environment when traveling by plane or riding in a car. It all comes at a relatively low cost, as well: you can offset emissions for a 12-hour flight for the price of an airport"