“A study reviewing environmental impacts of cannabis cultivation shows that growing the plant in both indoor and outdoor environments is water-intensive and that the high demand for water ultimately leads to water pollution and diversion.” 

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Cannabis requires more water than commodity crops, researchers say (mjbizdaily.com)

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“Outdoor marijuana grows consume an estimated 29.4 million gallons of water per year.” (In CA) California Marijuana_Impact_Report_2022_FINAL.pdf

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“The energy and materials required to grow cannabis indoors was studied and quantified the corresponding greenhouse gas emissions. The analysis was performed across the United States and accounted for geographic variations in meteorological and electric grid emission data. Greenhouse gas emissions for legal cannabis ranges from 2,283 – 5,185 kg CO2-equivalent per kilogram of dried flower. Using the EPA calculator, this is equivalent to 583 gallons of gasoline consumed.” -The greenhouse gas emissions of indoor cannabis production in the United States | Nature Sustainability