In An Inconvenient Truth, Al Gore produces a graphic of the cities to which he has flown (sometimes by private jet) to talk about climate change. There are dozens of them, all over the world. I am glad that he gave those talks--his contribution to the fight against climate change is equal to that of all other environmental campaigners put together. But I was shocked not so much by his mode of travel as by his total lack of embarrassment--even, perhaps, of awareness--about the contradiction between what he was saying and what he was doing.

In Europe, where the environmental impacts of transport have been subject to furious debate for years, a climate change campaigner would never have exposed himself in this way. Had he flown as much as Gore, he would have felt it necessary to explain that he could not otherwise have been so effective. He would never set foot in a private jet. He might have conducted his talks by video link--and made a point of that in the film.

Jets produce staggering amounts of carbon dioxide and other gases that accelerate global warming. But in North America the impacts of transport--especially flying--are only beginning to nudge the political surface.

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