Only the liberal climatologists are wringing their hands. The rest of 'em realize that there is only 150 years or so of recorded data to study, which demonstrates little, or nothing. The Cretaceous period was the most recent period of the Mesozoic era, and lasted millions of years longer than the period we are in today. And, it was a bit warmer then. With no human activity, and none of your hot air, either.
Ted