New York Times: In less than a month, Canada has executed a complete about-face on global climate change. With the defeat of the Conservatives in the October general election, out went nearly a decade of Canada making itself something of a global outcast on the issue. The record of the former prime minister, Stephen Harper, on climate change was marked by retreat, foot-dragging, and hand-wringing over the economic consequences of moving too quickly. The new prime minister, Justin Trudeau, and his Liberals are...