Global Warming and our Changing World

I've heard that potentially, all of today's problems could cause the U.S. dollar to crash, and lead politicians to lobby for a single, unified currency worldwide. This would supposedly be done to promote and ensure economic stability.

Why would the dollar crash? If global warming continues and worsens, economic disasters could put a strain on our economy. If the oceans heat up too much, the ecosystem could be fundamentally altered in a way that has widespread effects across the food chain. This would limit the amount of food available, and we'd have to work harder and put more resources to use in correcting that imbalance. With fewer resources at our overall disposal, we'd then be more vulnerable to further financial woes, which could potentially lead to a major depression. At that point, if there were no other measures in place to prevent the dollar crashing, a one-world currency could seem like a good last resort. After all, the U.S. is interacting with many other countries, and is depended upon financially in many different areas. If our economy fell apart, the world would be worse off. So any alternative to that, including a single global currency, would be seen as potentially worthwhile.

Will it come to pass? Tick, tock...