Climate Scientists -- stuck on stupid

Ten of the usual suspects rounded themselves up to publish a really stupid letter. Dumb.  They ask that the climate impact of the Canadian tar sands oil be evaluated as part of the Keystone XL Pipeline evaluation.  But the Canadians are going to extract the oil regardless of the pipeline.  The only climate impact of the pipeline, even if one accepted the bizarre global warming theory at face value, will be to cut down on the fuel that would be used by tankers shipping it to China if the pipeline isn't built.