Keeping Our Cool as Population Booms

It's appropriate to advocate for the use of more efficient, less carbon-emitting chemicals for air conditioning, but the growing number of people needing air conditioning in a warming world deserves equal or greater focus. I make this argument in a New York Times Letter to the Editor, in response to an article that singles out the importance of finding a better refrigerant now that hydrofluorocarbons (HFCs) have been proven to be a deeply flawed alternative to the chlorofluorocarbons (CFCs) that were poking a hole in our ozone layer before the Montreal Protocol reined in their use.