Discord in Congress highlights the challenge for the U.S. of confronting global warming. Diplomats will descend on Paris at the end of November for United Nations climate talks that could prove pivotal in the fight against global warming. President Obama has labored to show that the U.S. is serious about taking action to stave off the worst impacts of rising temperatures. But Republican critics, led by Senate Majority Leader Mitch McConnell, are warning the world that the president’s environmental promises are built on shaky ground—and could easily crumble. Republican opponents lack the votes to block the central pillars of the...
