depends how big it is surely. A few miles across and we would be screwed
Oh, even a half mile across would have major, worldwide consquences. The reason I said that about it "only" being a regional catastrophe was that the Russian thinks this is going to hit in the general vicinity of Moscow, with "thousands" killed. That's not a "giant comet." He blew it about "top speed," because this thing cannot be at perihelion, so he's probably full of it anyway.