“Rising incomes are making air conditioners more attainable, while rising temperatures are making them a necessity. ‘There are hundreds of millions of people for whom air conditioning doesn’t seem like a luxury good,” said Michael Greenstone, director of the Energy Policy Institute at the University of Chicago. ‘It can mean the difference between life and death.'” The Verge with an update on the race against heat. How do you cool 7.5 billion people on a warming planet … without warming the planet even more?