The battle to reduce greenhouse gas emissions is heavily focused on replacing fossil fuel power plants with renewable energy and replacing internal combustion engine autos with electric cars. But there is another elephant in the room: air conditioners.
There are 35 megacities in the world – metropolitan areas with more than 10 million people. Fifteen of them have populations above 20 million. And many of these teeming metropolises have to contend with some of the worst air pollution on the planet.
