I keep seeing the call for a “no fly zone” over Ukraine repeated online and in the media. At this moment in time, there is nothing that would likely assure the end of civilization and our biosphere than NATO implementing such a thing. If they did, then member countries in this military security pact would be obligated to fire upon not only Russian aircraft, but airfields. It would be an act of war. And Putin has already vowed to make those nations pay a high price, as he placed Russia’s nuclear arsenal on high alert.