Reuters: Polar bears may have it relatively easy. It’s the tropical creatures that could really struggle if the climate warms even a few degrees in places that are already hot, scientists reported on Monday. That doesn’t mean polar bears and other wildlife in the polar regions won’t feel the impact of climate change. They probably will, because that is where the warming is expected to be most extreme, as much as 18 degrees F (10 degrees C) by the end of this century. But there are far …