I think what you are describing has more to do with plate tectonics than climate change.I don't buy in to the climate change arguments of today. I really think it's been going on since creation of this planet and only small percentage to be man-caused.
There is evidence that the Sierra Dessert was once full of lakes and deep forests.
There is evidence that Wyoming and Colorado were at one time under the ocean. Archaeologists are always finding fossil evidence to support that claim.
There is evidence that Death Valley in Nevada and Arizona was once colder than Alaska. My bet is in the next million years, Alaska will become a desert as the plates covering the earth continue to move.
Climate is evolving. So far, none of the arguments presented by the so called climate change experts have panned out and neither has any of their predictions.
However, climate change is happening and there is nothing man can do to stop it or slow it down. Now pollution is a different story. That is generally man caused and something we can do something about.