Legal cannabis cultivation in Colorado caused habitat encroachment into threatened species areas
Geospatial analysis found that licensed cannabis cultivation in Colorado caused over 67 hectares of land use change, new fencing, and vegetation clearing in areas harboring threatened and endangered species.
Quick Facts
What This Study Found
From 2011 to 2016, licensed cannabis cultivation resulted in over 67 hectares of land use change toward more developed uses. Nearly 15 km of new fencing was constructed establishing over 38 hectares of fenced areas, and nearly 60 hectares of vegetation was cleared. Much of this change occurred within habitats of threatened and endangered species.
Key Numbers
67+ hectares of LULC change. 15 km of new fencing. 38+ hectares fenced. ~60 hectares vegetation cleared. Changes primarily from outdoor and greenhouse facilities in rural areas.
How They Did This
Geospatial analysis of licensed recreational cannabis cultivator locations in Colorado. Examined distribution of cultivators, potential habitat infringement of threatened and endangered species, and land use/land cover (LULC) change from 2011 to 2016.
Why This Research Matters
Legalization is often framed as environmentally beneficial by moving cultivation indoors and under regulation. This study shows that legal outdoor and greenhouse cultivation can still cause significant habitat encroachment.
The Bigger Picture
Cannabis legalization creates a new agricultural industry competing for land. Without policies specifically directing cultivation to urban indoor facilities, habitat loss may be an unintended consequence of liberalized cannabis laws.
What This Study Doesn't Tell Us
Single state (Colorado). LULC analysis may not capture all environmental impacts. 2011-2016 timeframe may not reflect current patterns. Cannot determine species-level impacts from habitat proximity alone.
Questions This Raises
- ?Would mandating indoor urban cultivation prevent habitat encroachment?
- ?How do environmental impacts of legal cannabis compare to other new agricultural crops?
Trust & Context
- Key Stat:
- 67+ hectares of habitat change; threatened species areas affected
- Evidence Grade:
- Detailed geospatial analysis with specific land use measurements, but single state and limited timeframe.
- Study Age:
- Published in 2022, covering 2011-2016.
- Original Title:
- Legalization of Cannabis and Agricultural Frontier Expansion.
- Published In:
- Environmental management, 69(2), 333-352 (2022)
- Authors:
- Klassen, Mark, Anthony, Brandon P
- Database ID:
- RTHC-03969
Evidence Hierarchy
Watches what happens naturally without intervening.
What do these levels mean? →Frequently Asked Questions
Does legal cannabis farming harm the environment?
In Colorado, licensed cannabis cultivation caused over 67 hectares of land use change, including vegetation clearing and fencing in areas that overlap with threatened and endangered species habitats.
Can cannabis legalization be environmentally friendly?
This study suggests policies should encourage indoor urban cultivation rather than rural outdoor or greenhouse operations, which were the primary drivers of habitat encroachment.
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Cite This Study
https://rethinkthc.com/research/RTHC-03969APA
Klassen, Mark; Anthony, Brandon P. (2022). Legalization of Cannabis and Agricultural Frontier Expansion.. Environmental management, 69(2), 333-352. https://doi.org/10.1007/s00267-021-01555-x
MLA
Klassen, Mark, et al. "Legalization of Cannabis and Agricultural Frontier Expansion.." Environmental management, 2022. https://doi.org/10.1007/s00267-021-01555-x
RethinkTHC
RethinkTHC Research Database. "Legalization of Cannabis and Agricultural Frontier Expansion..." RTHC-03969. Retrieved from https://rethinkthc.com/research/klassen-2022-legalization-of-cannabis-and
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.