As climate change heats up, air conditioning has gone from being a luxury to a survival tactic. “Older Americans, who can still recall the preternatural cool of movie theaters as a rare escape from the tedious heat of summer, must now consider the physical stress of hot weather as a significant determinant of mortality.” But as air conditioning cools off more and more people across the globe, it’s adding to the problem that made it a requirement. WaPo (Gift Article): Addicted to Cool.