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It doesnt matter that it is an "SUV" - its carbon footprint is largely determined by its size/weight and its fuel efficiency.
So many of you people are screaming that he should have gotten a Wagon or a minivan - WHY????????????????????????????????
A Mitsubishi Outlander weighs less (3395 lbs) and gets better mileage (20/25mpg) than either a Volvo V70 wagon (3527lbs and 16/25mpg) or a Honda Odyssey minivan (4387lbs and 16/23mpg) and you will find similar results for most other vehicles in these classes (wagons and minivans) - except for those in the compact or sub-compact size (which are few)
So now don't you feel like dummies yelling at the (yes - hypocritical) author when you praise or ignore all those wagon and minivan drivers?
And I'll say it again - from a Carbon Footprint point of view - a used Ford Expedition is more "efficient" then virtually any new car that it built for you.