War with Russia?

Could global warming pose the greatest threat to the future of life on the planet?  Quite possibly, if we believe the international (and scientific) consensus, despite a widening stratum of debunkers, deniers, and skeptics.  What about the prospects of thermonuclear war between the United States and Russia, two countries armed to the max and seemingly moving toward the brink of military conflict?  Where does that rate?   If the question is asked of most any Beltway denizen, the response might be something along lines of “sounds frightening, but right now we have other priorities, and we can