In the past when these same conditions appeared many species went extinct, many species adapted, former jungles turned into deserts, many deserts turned into grasslands, and grasslands into jungles. Lakes dried up and lakes formed.

And everything had thousands upon thousands of years to adapt. And every response was a local one.

Precursors of Homo Sapiens Sapiens went extinct. Others blossomed. None of them had armies, nuclear weapons, an ability to go clear 'round the world to rob others of their resources.

Now, this is happening so fast, that no one has time to adjust. And Homo Sapiens Sapiens regards itself as sacrosanct. Not only does Man not want to go extinct, Man's various tribes regard themselves as more important that all the rest put together. The response will be global, as there are struggles over fresh water, food, and more struggles over energy.

It's happening so rapidly that measured, gradual reactions aren't possible. There is no simple evolution which allows people to migrate to avoid the effects. And nature doesn't really care if Homo Sapiens Sapiens lives or dies.

And many Homo Sapiens Sapiens don't care if Man lives or dies, either, as long as they can live their chosen lifestyle while they are around.

So the fundamentalists are right, in that this has happened before. They ignore what happened when it did, and they ignore the speed at which it is happening now. God gave man dominion over the Earth and Man screwed it up in only a few thousand years. So much for the survival value of big brains. With them come big egos, which self-destruct.