Authors see an opportunity to promote climate justice and renewable energy
                                
                                
                                    (Newser) -
                                    Currently, there are 2 billion air-conditioning units in use around the world, and the International Energy Agency expects 4 billion more by 2050. There’s a big problem baked into those numbers, but it’s also a big opportunity, according to Rose Mutiso and coauthors, who argue in  Scientific American...