As most of the U.S. gears up for a hotter than average summer, many might be inclined to stay inside and crank up the AC.  But air conditioning has a big environmental footprint. “Air conditioners are not the most climate friendly solutions because they're extremely energy intensive, they use a whole order of magnitude more electricity than fans, and because they're so energy guzzling, they place quite a large strain on the [fossil fuel] electricity grid,” says Radhika Khosla, associate