Anyway, the point is that Global Warming is a long term problem that we don't understand all that well. Given that the Earth right now is colder than optimal for life, it may well be beneficial--if we're still around to enjoy it
Our problems are closer than next century or even next decade. And pretty soon one of them is going to get us. A global economic collapse is a real possibility, but it probably won't start in America. The problem is that it can start anywhere
. The likelyhood of a significant nuclear exchange goes up with every state, whether or not a "rogue", that developes nuclear weapons, and we'll develop bioweapons capable of ending all human life well before we develop a reliable protocal for countering such weapons. A comet hitting the Earth might still be dismissed by some as science fiction, but it has happened in the past and will again. The only thing science fictional is that we would be able to do anything about it if one shows up in the next few years. On the other hand, our western love of technological progress may yet kill us all.
In any case, even a "minor" catastrophe could cause enough economic disruption that self-sufficiency is hardly an irrational idea. Americans had a brief craze for 72 hour kits after 9/11, and long term food storage has always been popular in the western states. Keep in mind that one of the supplies you'll need is ammunition