Climate change is demonstrably happening and already having drastic effects right now. Nuclear war is a thing that may or may not happen, but there's no sign ri

Climate change is demonstrably happening and already having drastic effects right now. Nuclear war is a thing that may or may not happen, but there's no sign right now that it would, so it's a distant hypothetical, much like being hit by a random meteor. It's obvious that the thing happening right now, continuously being reported on, would produce more concern.