PRESIDENT OBAMA began his second term with a promise to push harder on energy and climate change. The events of the past week remind us that he wonÂ’t have to contend just with Republicans and coal-state Democrats determined to oppose reasonable measures to combat global warming. He will also have to sidestep environmentalists demanding that he fight the wrong battles. Last Friday, the State Department released a new draft analysis of the Keystone XL oil pipeline, opposition to which has become a counterproductive obsession of many in the environmental movement. In its 2,000 pages, the report dismantled the case that...