In this month’s environmental outlook, a look at the growing reliance on air conditioning. This summer marks the 100th anniversary of the air conditioner. Since its invention, air conditioning has provided relief from the heat and allowed industry to thrive in the hottest of places. But flipping on the air conditioner to cool off may be warming up the earth. The U.S. is the biggest air conditioning consumer, but use in countries like China and India is skyrocketing. Some scientists say the gases and electricity the units run on are contributing to global warming. Diane and her guests discuss the demand for air conditioning and the search for a cleaner way to cool.