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"What does Katrina have to do with optimum the optimum temperature for human habitation? Are you going to try to blame katrina on manmade global warming when you haven't yet proven manmade global warming?"

Humans have shown that they can adapt (not always easily) to nearly any climate.  But do you really think anyone is going to build a city like Los Angelos in the mIddle of the Sahara, or the Anarctic?  A huge percentage of the world's population lives along the coasts of our oceans and seas.  I have no doubt that we will see a significant rise in global sea level.  We are already seeing it.  Which is why I opposed re-building New Orleans.  It's a complete and total waste of money and resources to contnue habitating that piece of land.

Look, we can either start planning to mitigate these things now and then implimenting them, or we can let nature do it for us at the cost of millions of lives (not all at once, but surely it will come, nonetheless).