I look at the world as it is today. I see Europe and the European Union on the brink of financial disaster. And we, because of treaties with the IMF, are directly connected to them. Should they collapse, that will bring us down financially right along with them. But you want to know something? No matter what mankind has done or continues to do to our beloved little planet, it's NOTHING compared to what can happen the day mother nature gets up on the wrong side of the bed.
Examples.... Had a Katrina like storm hid New York City, estimated dead, over 100,000. Quite a few of us here I would assume were old enough to remember when Mt. St. Helen's erupted. Fact is in the volacano terms was a minor burp, and still managed to cool the entire planet down by 1 degree for two years. Now think about this, when the caldera under Yellow Stone eventually pops, there goes pretty much all of America's bread basket....for years! This is one of the reasons I was inquiring about a greenhouse in another forum. There might, and I will admit there's only a slim chance of this happening in my life time, chance of a rapid weather change that could prevent any of us from growing outdoors. Everyone knows that eventually California is going to be hit by the "big one". So they've actually prepared for this. But, what about New Madrid fault? That pops again, St. Louis and Memphis will be flattened most assuredly. But of major consequince, there's major fuel (natural gas and oil) lines, rail road and highways that cross the mississippi. If you took that section from St. Louis down about 200 miles and removed every bridge, how much food and resources you think the rest of the bridges can handle?
The Boy Scout motto...."Be Prepared!" You can't prepare for everything. It's impossible to do so and any attempt would just drive one insane. If we start worrying about every little thing that "might" happen, would life really be worth living? I personally don't think so. But we can plan for most things. The rest, well, we'll just have to see.