"Pick Your Poison"

In a world where ExxonMobil is willing to pay scientists and pseudo-scientists serious money (allegedly 10K a "researcher") to help criticize or raise skepticism about global warming, which contrasts to past global warming skeptics like Bob Inglis (R-S.C.), Pat Robertson, Frank Luntz, and Gregg Easterbrook finally waking the hell up about the effects of global warming, this link provides some advice on where to buy your gas.

Link: http://sierraclub.org/sierra/pickyourpoison/

As you can see, BP, Sunoco, or Shell are your best bets. Sunoco is the only American company.

Where you spend your gas money is a political statement.