[Michael Barnes]

Same. We (humans) are existing in between ice ages. The Earth has more ice ages than habitation cycles. It's why I don't think we are going to find "life" anywhere else anytime soon; species on other planets most likely go through critical extinction events and it takes hundreds of thousands of years for the planet to "reset" and become habitable again.

It's just "nature".

[henkster]

We are still in an “ice age.” Permanent ice, as it exists in the ice caps on Greenland and Antarctica, are estimated to have existed for only about 5% of earth’s history. Most of the time, the earth is a much warmer and steamier place.

A couple other things of note for routine discussion with the “man-made climate change” crowd. Just mention “Medieval Warm Period” and “Interglacial Period.” In the Medieval Warm Period from about 850 A.D. to 1300 A.D., the Vikings raised cattle in Greenland and grapes in Labrador. No one does this today. It’s too cold.

For “Interglacial Period” you go back 70,000 years; where I am in the midwest was under a mile thick sheet of ice. The world was a much colder place then.

The climate is not constant and always will change. There is no “optimal climate.” No scientist really knows why either of these two events took place but one thing is certain; man had NOTHING to do with either of them. It is a high form of sin to think that man can control what happens on this world.