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I was surprised that McKibben downplayed the impact of jet travel. A NY Times article from November 18 - "Paying More for Flights eases Guilt, not Emissions" cites a British study that found that a flight from NYC to London produced more carbon than a British person's entire yearly commute. So if you are teaching people to potluck and ride buses, and those same people are jetting around during their free time, it's a joke. This shows how sticky and thorny environmentalism is, even for someone like Bill McKibben. Some things we really love, activities that are a huge part of our identity - like globe trotting - are horrible for the environment.