Not to mention it was hotter in the Middle Ages than now, when there were no cars and stuff like that

It is human arrogance to believe making regional changes at an astronomical cost will somehow stop changes to the climate that have occurred independent of man for millions of years.

15,000 years ago New York City was covered with 3000 feet of ice. That is scientific fact. Another scientific fact is it did not melt because caveman were driving Hummers.

yep