Andrew Leonardyes explains how AC use increases global warming, which increases temperatures, which increases AC use:
There's no doubt that high temperatures translate immediately into increased burning of fossil fuels -- and, inevitably, increased concentrations of greenhouse gases released into the atmosphere. This year is on track to be one of the hottest years in the historical record. If fossil fuel consumption is contributing to a warmer world, then our efforts to cool ourselves are only going to make matters worse.
And there are still quite a few people in China and India and elsewhere who do not yet have air conditioners -- but intend to get them. Wanna save the world? Invent a low-power home cooling mechanism.