Cannabis farming’s energy use now rivals major industries like cryptocurrency
Indoor cannabis cultivation now accounts for about 1% of U.S. electricity use, emitting more greenhouse gases than bitcoin mining and all other crops combined, researchers say.
Nicolás Rivero reports for The Washington Post.
In short:
- Most U.S. cannabis is grown indoors under high-powered lights and climate control, creating emissions equivalent to 10 million cars annually.
- Experts say shifting production outdoors could cut emissions by 75%, but unpredictable weather, potency concerns, and zoning restrictions make that unlikely.
- Indoor growers are adopting efficiency upgrades like LED lighting and renewable energy credits, though these changes only modestly reduce emissions.
Key quote:
“It’s another looming energy issue. Cannabis right now is the dominant part. But if the proponents of indoor agriculture got their way, it would be overshadowed gradually by all these other crops.”
— Evan Mills, energy researcher
Why this matters:
Indoor cannabis farming has quietly become a major source of carbon emissions in the United States. Unlike other agricultural sectors, it runs almost entirely on artificial light and climate control systems, which guzzle electricity. As cannabis legalization spreads, production is scaling up in sprawling warehouses, putting growing pressure on the grid and fueling greenhouse gas emissions. With limited regulation and no consumer labeling for carbon footprint, most buyers have no idea how energy-intensive their weed is. Meanwhile, local opposition to outdoor farming and the industry's preference for indoor consistency mean emissions are likely to grow. This has broader implications as indoor agriculture expands to other crops, raising concerns about a future where our food — and weed — might be cultivated at the cost of a hotter planet.
Read more: Indoor farming's impact on the environment scrutinized amid tech advances
