Keystone Foes Seek Climate Measures in Case They Lose

President Barack Obama is being pressed by opponents of the Keystone XL pipeline to tie any approval to measures that would curb climate change, reflecting mounting pressure on the administration to mitigate the project’s impact if it goes forward.

Senator Sheldon Whitehouse, a Rhode Island Democrat, is among those urging new steps to limit greenhouse-gas emissions in the U.S. if TransCanada Corp.’s petition to build the $5.3 billion pipeline is approved. Other lawmakers say the administration could extract concessions from Canada, such as a higher carbon tax in Alberta, where the pipeline to carry tar-sands oil to U.S. refineries originates.