The Quest For Greener Weed

Growing weed isn't usually very green. In rural California, where marijuana is the top cash crop, it uses massive amounts of water during the drought. In fragile Northern California ecosystems that are just starting to recover from the logging industry, guerrilla weed growers are chopping down trees, eroding hillsides, poisoning wildlife, and illegally sucking up water from rivers and streams.

Indoor pot farms aren't necessarily better; the typical indoor operation uses more energy per square foot than a data center. A 2012 study of marijuana's carbon footprint estimated that it accounted for 3% of all the energy used in California—as much as the energy used by 1 million homes, or the carbon emissions from 1 million average cars.

Now that legal marijuana is the fastest-growing industry in the U.S.—and the environmental effects are multiplying—some growers are rethinking the sustainability of their methods.

Green Life Productions, an indoor medical cannabis farm...

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