In 1050 A.D., the planet was a couple degrees hotter than it is now; yet here we are.
20,000 years ago, New York City was covered with 15,000 feet of glacial ice. Expose boulders in New York City central Park are marked with glacial stations. This is settled science. I can guarantee you all that ice did not melt because caveman were driving Hummers.
Think again.