Jumping into the issues of the day, Pope Francis opened his visit to the United States with a strong call Wednesday for action to combat climate change, calling it a problem that “can no longer be left to a future generation.” President Barack Obama, in turn, hailed the pontiff as a moral force who is “shaking us out of our complacency” with reminders to care for the poor and the planet. The White House mustered all the pageantry it had to offer as the pope arrived at the White House before an adoring crowd of thousands and a nation that...