Greenhouse gas emissions from the legal marijuana industry have climbed so quickly in recent years that they now equal that of about 10 million cars, according to a newly published study into the energy and emissions of cannabis production.

A switch from indoor to outdoor grows, however, could lessen that environmental impact by lowering emissions as much as 76 percent.

Additional policy shifts that could reduce emissions include increased home growing of cannabis, wider use of greenhouses by cultivators, use of more energy efficient varieties of the plant, implementation of on-site solar and other updates.

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