The legal marijuana business is growing rapidly, offering potential riches to savvy entrepreneurs who get in at this early stage. But for most growers, a major obstacle stands in the way. The indoor systems they use require massive amounts of energy--and, in turn, money--to keep running.A recent study by researcher Evan Mills estimates that at least one percent of the total power usage of the U.S. is consumed by indoor weed grows. For industrial cannabis growers like Denver-based Medicine Man, which has a 60,000-square foot warehouse with 14 grow rooms, all that electricity usage adds up to a $40,000 bill each month.As the marijuana industry matures, business owners increasingly are turning to a cheaper, more efficient alternative to indoor growing: greenhouses. They've forged a mutually beneficial (if somewhat unlikely) relationship with makers of traditional agriculture greenhouses, as well as several newly founded manufacturers. This book is your complete guide to running a successful Cannabis Business!