The puzzle over climate change is not scientific but political — or religious or ideological. Science shows clearly that mankind is not changing the climate in a dangerous way. The puzzle is why so many people are determined to believe that we are. Why do they love the idea of impending climate catastrophe? Why are they so horrified by the vast improvements in human welfare over the last decade? Why are they so determined to believe the blatant nonsense of “97% of scientists” or the Hockey Stick graph (showing temperatures steady from 1000 AD to 1900 AD and then shooting up to unprecedented highs in the 20th Century)? Why do they hurl such curses against “denialists”? There are two reasons: money and ideology.