When John Barrasso, a Republican from oil and uranium-rich Wyoming who has spent years blocking climate change legislation, introduced a bill this year to promote nuclear energy, he added a twist: a desire to tackle global warming. Mr. Barrasso’s remarks — “If we are serious about climate change, we must be serious about expanding our use of nuclear energy” — were hardly a clarion call to action. Still they were highly unusual for the lawmaker who, despite decades of support for nuclear power and other policies that would reduce planet-warming emissions, has until recently avoided talking about them in the context of climate change. The comments represent an important shift among Republicans in Congress. Driven by polls showing that voters in both parties — particularly younger Americans — […]