More than a third of the heat-trapping gases cooking the planet come from growing and raising farm animals, but millions of cattle, pigs and other animals get to stay cool in the United States and other parts of the developed world.
Many American farmers have apps to forecast animal comfort in the heat. There are computer-controlled “ cooling pads ” for sows. Dairy farmers lower barns' temperatures with misters, air conditioning and giant fans. Special pedometers, the cow version of a Fitbit, measure vital signs that give clues to animals' health.
