Robert Samuelson writes on the folly of the attempts to block the planned Keystone XL pipeline that will move oil produced from Canadian oil sands developments to refineries in Texas. The most salient argument is the fact that if we don't build the pipeline, the Canadians will, to the West Coast, and then sell the oil to the Chinese. This would understandably create more greenhouse gas pollution (while of course driving up oil prices and production costs and necessitating we buy our oil from overseas thugs), but this sort of logic never gets in the way of environmentalists and their ideals, as Daryl Hannah's arrest in front of the White House the other day for protesting the pipeline amply demonstrates.