Climate change IS happening, that much is undeniable, but whether or not it is manmade or not is debateable. I remember many years ago standing outside of a McDonald's in the parking lot eating an ice cream cone with my father and he said, "son, when I was your age, the sun was our friend..." And it's become even more oppressively hot since then! A portion of the increaing temperatures has to do with the urban heat island effect, though, where pavement, roofs and other manmade structures absorb heat rather than deflect/dissipate them. Have you seen the highs and lows in Phoenix lately? Insane.