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Ain’t eBay grand? For $10 you can buy a sack of 50 assorted Obama ’08 buttons, and that’s what I’ve been doing. If you look closely, you might see them this weekend on the lapels of some of the global warming protesters holding a sit-in outside the White House.

Already, more than a thousand people have signed up to be arrested over two weeks beginning Aug. 20 – the biggest display of civil disobedience in the environmental movement in decades and one of the largest nonviolent direct actions since the World Trade Organization demonstrations in Seattle back before Sept. 11. (Among the first 500 to sign up, the biggest cohort was born in the Truman administration, followed closely by FDR babies and Eisenhower kids. These seniors contradict the stereotype of greedy geezers who care only about their own future.)

The issue is simple: We want the president to block construction of Keystone XL, a pipeline that would carry oil from the tar sands of northern Alberta down to the Gulf of Mexico. We have, not surprisingly, concerns about potential spills and environmental degradation from construction of the pipeline. But those tar sands are also the second-largest pool of carbon in the atmosphere, behind only the oil fields of Saudi Arabia. If we tap into them in a big way, NASA climatologist James Hansen explained in a paper issued this summer, the emissions would mean it’s “essentially game over” for the climate. That’s why the executive directors of many environmental groups and 20 of the country’s leading climate scientists wrote letters asking people to head to Washington for the demonstrations. In scientific terms, it’s as close to a no-brainer as you can get.