When the health of the planet doesn’t move us, our skinny pocketbooks can.

Elizabeth Kolbert writes that the U.S., which accounts for 25% of the world’s oil consumption but only 5% of its population, did not take collective action to curb greenhouse gases until gas shot to $4 a gallon:

No matter how many warnings about the consequences were issued—by NASA, by the United Nations, by Al Gore, by the Pope—Americans seemed unfazed. Even as the Arctic ice cap visibly melted away, they bought bigger and bigger cars and drove them more and more miles.

The impact of rising fuel prices, by contrast, has been swift and appreciable. According to the latest figures from the Federal Highway Administration, during the first five months of this year Americans drove thirty billion fewer miles than they did during the same period last year. This marks the first time in a generation that vehicle miles in this country have edged downward. All told, undriven trips since the start of 2008 amount to some thirty billion pounds of unreleased CO2. Clearly, the only way to change America’s consumption habits is by making those habits more expensive.

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