The cannabis industry is hiding a dirty little secret. According to Evan Mills, a California-based energy and climate change scientist, the marijuana industry has a major problem…and it’s likely to get worse before it gets better.  “Legislators and energy agencies have largely turned a blind eye to the carbon footprint of indoor cultivation, which already belches out greenhouse-gas emissions equal to that from 3 million cars in America,” says Mills.In fact, just one marijuana cigarette creates over 10 pounds of carbon…