It might be all-natural, but that joint you're smoking has a serious carbon footprint: marijuana growth uses 1% of all U.S. energy. More »

Read more: http://feeds.gawker.com/~r/gizmodo/full/~3/6mZ9LoSyZxY/buzzkill-of-the-day-us-marijuana-industry-responsible-for-5-billion-in-energy-consumption