Markets in everything... so you've got a guilty conscience?

An interesting business idea for private consumers... From Slate

If you're feeling guilty about driving your giant sport utility vehicle (but not so guilty that you'd ever give it up), salvation is at hand. For a yearly fee of around $80, a company called TerraPass will offset the damage your SUV does to the atmosphere by spending your money to reduce industrial carbon emissions and to promote the spread of clean energy. They'll also send you a decal and a bumper sticker, so everyone in the neighborhood will know that your gas guzzler has been sanctified.
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Buying a TerraPass is a little like voting—irrational for any individual, given that elections are almost never decided by one vote, but collectively beneficial indeed.