Well, we have more than a few good estimates on when Peak Oil will occur (or when its already occurred), but are there any educated guesses as to when the oceans will rise 20' due to Global Warming? As I understand it, such an event isn't as imminent as Peak Oil, though I'm not as well informed on that subject.

I'll say this: if the oceans do rise 20', a lot more places than Bangladesh and the Caribbean islands will be in deep trouble. I guess we just have to pick our poisons. No place is going to be perfect in the coming collapse scenarios.

I think the estimate used to be 20' over a century, but I don't keep up with this at all.  I do know there is a bunch of good stuff at the RealClimate site:

http://www.realclimate.org/index.php?s=sea+level&submit=Search

I appreciate the link, odograph. That's a great source.