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You bought a big vehicle for particular reasons. So be it. But please take the responsibility of paying for the invisible costs.
1. Buy carbon offsets for every year you use this vehicle.
2. Get behind a gas tax in an active way--this is the biggest single key to environmental responsibility, but politicians simply can't/won't take the lead to bring it about. (Even John McCain once acknowledged the wisdom of this, in a time long ago and a galaxy far away . . .) Citizens are going to have to take the initiative.
Gas tax. Gas tax. Gas tax.
And by the way: you owe it to fellow drivers to be as polite as you can on the roads. Because oversized cars that make it impossible to tell if it's safe for me (in my compact car) to turn at an intersection are a big fat pain in the ass.