Bad news for environmentialist potheads. People growing marijuana indoors use 1 percent of the U.S. electricity supply, and they create 17 million metric tons of carbon dioxide every year (not counting the smoke exhaled) according to a report by Evan Mills, an energy analyst at Lawrence Berkeley National Laboratory. http://www.bizjournals.com/sanfranc...arijuana-causes-global-warming.html?ana=e_pft