cc Lyle
We didn't agree on one theory, but I like your words on this one.
It's a natural cycle that's been happening to the Earth for millions of years caused by things like solar activity, volcanic emissions, and variations in the Earth's orbit. Why would change in Earth's climate all of a sudden humans fault.
Either that or them Mammoth's must've been driving some mighty gas guzzlin' hummers back at the end of the last ice age during their changing Earth climate too.