Environmental impact of cannabis cultivation includes all the environmental issues which occur as a result of cannabis cultivation. Cannabis agriculture is a massive industry in its scope and extent, yet its environmental impact is much less researched than comparable agricultural products produced at this scale. Many countries around the world are liberalizing their cannabis policy which will make the industry grow, and as the industry grows, so does the urgency to respond to special considerations in environmental impact for this industry. The history of framing cannabis production as an issue of drug use has suppressed discussion about cannabis production as a massive agricultural sector. In places where cannabis is legal to product, discussing environmental impact is still challenging because so many other issues related to cannabis distract from the conversation. Indoor cultivation of cannabis is common and research intensive. A 2012 study estimated that 1% of energy production in the United States is for cannabis production, giving cannabis a substantial carbon footprint. That same study could not identify energy analysts or policymakers who had addressed the issue. The study noted that indoor cultivation is mostly a consequence of illegality, and if cannabis were legal, then outdoor cultivation would greatly lower this use of electricity. A United Nations report compared the environmental impact of cannabis against other drugs and found that cannabis pollutes less with dangerous chemicals. Cannabis production does tend to disrupt fragile and remote environments due to the farmers hiding the crop rather than using conventional farmland. Cannabis plants produce volatile organic compound in great enough amounts to increase the criteria air pollutants in indoor and outdoor environments. This creates an occupational health hazard in areas with large numbers of plants. Cannabis in California is a frequent focus of study. One study found that cannabis production diverts water from watersheds. Encroachment in public land has been a frequent occurrence. Various legal pressures in California has led some production to be indoors. Getting quality data in California has been a challenge. Cannabis in comparison to other crops could be an environmental benefit.
