The heat wave that blanketed the east coast in mid-July was the longest to hit New York City in a decade. Not surprisingly, the Big Apple broke records for energy usage, as sweltering city-dwellers turned up the AC. The US leads the world in climate control – but at a significant financial and environmental cost. Leon Neyfakh is a reporter for the Ideas section of the Boston Globe – and author of the article “How to Live Without Air Conditioning”.