Keystone XL Pipeline

In Keystone snub, Obama tries to lockdown his climate legacy

For years, President Barack Obama chided Republicans and Democrats alike for treating the Keystone XL pipeline as a signal of whether the U.S. would seriously fight global warming. Now that he's killed the project, Obama is holding it up as Exhibit A as he works to lock in his environmental legacy with a powerful international climate accord.

Rejecting Keystone, the proposed 1,179-mile crude oil pipeline from Canada to the U.S., was the latest in a long and growing list of steps Obama has taken to try to show that the U.S. is leading the effort against global warming. Even while Republicans have fought Obama tooth-and-nail at home, he's sought to use those steps to pressure other...