The legal marijuana market is expanding as recreational and medicinal restrictions are increasingly lifted in the U.S. As a result of this: How can environmental regulations keep up with an industry that requires excessive amounts of water and contributes additional runoff of pesticides and other contaminants that threaten water supplies, wildlife, and vegetation? Are cultivation practices such as aeroponics and energy-efficient greenhouses enough to offset the environmental impact? Does the onus of sustainable practices fall to the growers or the state?