R04 — Environmental Footprint of Cannabis Cultivation

ChatGPT independent research input · September 6, 2026
Authority: R04 brief v1.0, FROZEN September 6, 2026; Protocol v1.4.
Audience: CCKE editor, for verification, critique and claim extraction alongside the independent Gemini run.
Status: Research handoff, not an approved corpus ledger. Final evidence status and confidence remain for the editor.

Executive finding

The defensible output is a map of environmental pressures with different boundaries, rather than a single footprint for cannabis. The inherited R05 carbon literature remains useful, but recent studies add facility cases, drying-process analysis and adjacent hemp experiments without making existing estimates interchangeable. The strongest new contextual water evidence is a 2026 Northern California catchment study: cannabis was seldom the largest modeled user, yet seasonal analysis still identified potential pressure during low flows. Neither a small sector share nor a low carbon intensity establishes ecological safety. Dillis, Baruch & Grantham, 2026

Three corrections deserve editorial priority. First, the famous per-plant water assumption is not a universal measurement. Second, potentially recoverable condensate is not demonstrated reuse. Third, California removed particular cultivation electricity-reporting and offset requirements in July 2026; descriptions of the former rules are now historical. The detailed records below preserve these distinctions. Bauer et al., 2015, PG&E field-study summary, DCC adopted rule

This is a bounded evidence review, not an exhaustive systematic review or a reanalysis of original datasets. Some full texts and supplements were inaccessible; those limitations are attached to the relevant sources and numbers. No contemporary nationwide inventory simultaneously resolves production systems, legal populations, all environmental categories and consistent lifecycle boundaries.

Scope, inheritance and reading conventions

The frozen pasted brief was read in full. The connected Drive R05 ledger and source library were consulted: R05 ledger, source library. The retrieved library is an early partial registry; its contents do not establish that every later corpus source was available. The temporary source keys below are local to this handoff and must not replace permanent source IDs.

Energy updates cover publications from January 1, 2025 through September 6, 2026 not already in the retrieved R05 materials. Older energy sources appear only for inventory, historical provenance, comparators or corrections, with the purpose identified. Water, land, chemicals, air and waste have no lower date cutoff. Hemp is explicitly adjacent evidence when its product or production population differs.

Types: M = measured physical quantity or observation; H = measured/reported inputs → modeled outcome; O = modeled outcome; A = assertion without traceable supporting analysis. Administrative records are identified as reported observations rather than independently metered measurements. A regulatory text establishes a requirement, not an environmental effect.

Quality axes: relevance, representativeness, transparency and reported uncertainty are assessed separately. A small experiment may answer a narrow causal question well; a regional model may answer a scale question better. A missing model detail in this review does not prove the original model is opaque. It does prevent importing its number into a quantitative comparison until that detail is recovered.

A. LCA and direct-measurement landscape

A1. Located cultivation LCAs and related carbon inventories

This table is a discovery inventory, not a ranking. Unverified method/allocation details are deliberately left explicit. Bibliographic identities and access notes appear in the source register.

Sources: E1, E2, E3, E4, E5, E6, E7, E8, E9, E10.

The new Washington thesis means a blanket claim that no mixed-system case exists would be too strong. It does not supply a representative, peer-reviewed decomposition of supplemental-light greenhouse, light-deprivation hoop, sealed greenhouse and in-ground drug-type field systems. No such complete system-resolved coverage was verified in this search. Do not carry forward “the single outdoor LCA” as a timeless description of all published work; retain it as the identity of the specific inherited E2 finding.

Adjacent downstream studies were located on hemp building materials (X1), residual hemp/CBD anaerobic digestion (DOI 10.1016/j.resconrec.2025.108525) and cannabis-oil biorefining (DOI 10.1016/j.biteb.2025.102252). The latter two are discovery records with incomplete author/method verification, excluded from quantitative synthesis. Seed/fiber studies appearing in review bibliographies are not a census of drug-type cultivation LCAs.

A2. Located physical-measurement, mapping and environmental-model studies

For non-LCA physical quantities, characterization and coproduct allocation are not applicable: no lifecycle impact conversion is applied. Atmospheric and hydrologic modeling methods remain necessary and are named. Detailed retained numbers are in H1, not repeated here.

All source links and titles are registered below. Additional located but incompletely extracted records: Parker-Shames’s 2022 dissertation includes experimental light/noise disturbance; Franklin et al. 2018 fisher rodenticide case study; Gabriel et al. 2018 owl exposure; Thompson et al. 2014 fisher survival; and an ETCC adaptive-daylighting greenhouse field study. These are retained in the unresolved-source list rather than silently treated as absent literature.

A3. Independence map

B. Energy/carbon update, scale and claim provenance

Update implication: E6–E8 widen the cases and process questions available to R04. They do not justify replacing R05 with a new pooled carbon range. E6’s abstract range is withheld from cross-study ranking pending reconciliation of point-of-sale boundaries and calculation variants. E8 is hemp with restricted energy coverage. E7 models a process intervention on an inherited cultivation inventory. No independently verified new representative construction/equipment inventory or universal greenhouse-subtype factor was obtained.

Inherited quantities are not refreshed merely by citing them today. E5’s annual US model describes a 2023 sector; E1 describes modeled indoor systems; E2 describes a Quebec container system. Sector totals answer a scale question, while kilograms of emissions per kilogram of flower answer an intensity question. Neither can substitute for the other.

Citation correction for the inherited library: E4’s journal title is The carbon footprint of indoor Cannabis production, not Up in smoke. The DOI identifies the former. Preserve the report precursor as a separate bibliographic object if registered.

Carbon storage: X1’s hemp building-material study addresses a durable product and biogenic-carbon accounting with an end-of-life exclusion. Its result cannot be transferred to harvested drug-type flower. A negative farm-gate balance would still need uptake, product lifetime, land-carbon changes and later release to be evaluated before calling it durable removal.

C. Water quantity, source and timing

W1’s familiar plant-demand value comes from a draft ordinance. W2 then scales an assumed demand using cultivation density and compares seasonal applied irrigation with a wine-grape reference. This is a chain of assumptions, not a paired crop experiment. Q2–Q3 retain the figures only to document that chain.

The measurement literature is not empty: W7 measures field evapotranspiration and W8 measures experimental irrigation, both in explicitly adjacent floral-hemp/CBD systems. Those observations do not validate a universal per-plant value. A field water balance includes evaporation and vegetation between plants; irrigation is only one possible input. Neither is automatically equivalent to water withdrawn from a stream.

W3 documents reported sources among enrollees, while W4/W5 address how storage separates extraction timing from application timing. Their compliance/enrollment definitions are not interchangeable with adult-use licensing. Evidence that wells are frequently reported is not evidence that wells have no streamflow effect. W6 adds a useful sector comparison but inherits demand models and omits pumping-depletion lag. Its result is evidence about potential catchment pressure, not directly measured cannabis-caused aquatic decline.

For an indoor balance, the accounting identity should reconcile external intake plus opening storage with closing storage, reject/discharge, harvested water and vapor exported. Internal condensate recirculation should not be counted as new external intake each time it cycles. W10 offers field-based recovery potential; E9 demonstrates a small condensate-reuse prototype. Neither source, as accessed here, closes a representative commercial balance including RO reject, nutrient discharge, treatment losses and vented vapor. No eligible fully verified integrated commercial balance was located within this search.

D. Land, habitat and wildlife

Land occupation, fragmentation and ecological injury are separate endpoints. L1 maps siting risks; L2 contrasts cannabis expansion with timber activity and distinguishes total extent from effects per affected area. A relatively small land area can matter if it fragments a sensitive landscape. Conversely, a high fragmentation intensity does not establish that cannabis is a large share of total agricultural land.

L3 updates the prelegalization emphasis with postlegalization spatial analysis. Associations between licensed-farm presence and lower unlicensed cultivation do not isolate a causal regulatory effect. Enforcement intensity, markets, local bans and site conditions can change simultaneously. This report therefore does not infer that licensing itself reduces habitat harm.

Scale result: no representative nationwide/global occupied cannabis-area denominator, matched to total agricultural land and year, was verified. Licensed canopy capacity, parcel area, mapped cultivation footprint and harvested area-year are different measures. A license count cannot establish production share; permitted canopy cannot be assumed fully planted or harvested. Local mapping establishes local extent, not a national percentage.

Wildlife residues and diagnosed deaths are real observations, but attribution must proceed separately. Q8–Q9 distinguish fishers tested, fishers exposed and diagnosed poisoning. L7 provides a counterweight: wildland–urban exposure associations leave dwellings and cultivation as unresolved sources. L6’s modeled habitat overlap is not the fraction of habitat cultivated or contaminated.

L8/L9 supply private-farm wildlife observations beyond trespass sites. Species-specific local activity responses should not be translated into population decline. A targeted final search also located experimental light/noise work in Parker-Shames’s dissertation; it was not fully extracted. Consequently, light/noise evidence is located but unresolved, rather than absent. Fencing-specific causal effects and cannabis-specific erosion magnitudes remain unverified in this review; general disturbance mechanisms alone cannot supply their magnitude.

E. Chemicals, nutrient fate and air

Pesticides: C2 detects soluble pesticides under targeted post-eradication sampling. C3 finds residues in soil at inactive trespass sites but no pesticides in its companion stream samples. These findings need not conflict: sampling medium, timing, detection method and sites differ. Detection is not a measured ecological injury; non-detection is bounded by analytical capability and sampling. Neither sample describes all unlicensed private farms or licensed production. Product-residue surveillance, including myclobutanil concerns, cannot substitute for soil/water environmental-fate evidence.

Nutrients: C1 directly demonstrates measured phosphorus loss in a small high-CBD hemp experiment. This answers the brief’s question about whether any nutrient-loss study exists. It does not measure receiving-water eutrophication or establish a high-THC commercial application prescription. E2’s nitrogen-related impacts are modeled fate/emission contributions. R01’s plant-demand timing hypothesis may explain a mechanism for loss, but timing mismatch is not a quantified environmental emission until discharge or a reconstructable fate model connects it to an endpoint.

Air: C4 is a scenario-based regional ozone study; C5 uses facility exhaust measurements and production records before modeling regional consequences. The latter materially qualifies a sweeping regional-air-quality claim. C6’s indoor generation rates are not direct outdoor release rates. Odor intensity and regional ozone contribution are distinct questions, so a small modeled regional effect does not dismiss nuisance or community experience.

For CO₂ enrichment, accounting should identify source gas, purification/compression/transport, onsite combustion where relevant, uptake and release. Temporary plant uptake is not permanent sequestration. The inherited LCA framework addresses enrichment inputs; no separately verified enrichment-only net-impact study was located. No generic credit for “recovered CO₂” is assigned.

F. Waste and material streams

E2 establishes that purchased growing media can be important in one outdoor container system. That does not establish peat, coco, rockwool and in-ground soil as equivalent, or permit a universal ranking of them. Substitution and reuse require material origin, processing, transport, lifetime, crop performance and disposal boundaries. A reduced burden in one impact category can coexist with a greater burden in another.

For pots, film, drip lines, filters, lamps and plant biomass, no representative mass-flow inventory covering all streams was verified. Packaging counts in Canada’s official review are administrative activity indicators, not measured plastic tonnage or lifecycle impact. Retail packaging is outside cultivation unless the boundary is explicitly extended. Assertions that packaging is the largest industry impact remain unverified; that does not establish that packaging is negligible. Health Canada review

Feasible valorization is not demonstrated displacement. Hemp building materials and residue-biogas studies have different products, allocation and counterfactual disposal assumptions. Vendor sustainability reports were used as discovery/context only where complete comparative inventories were unavailable. No eligible transparent, representative cannabis retail-packaging LCA was located within the documented search.

G. Mitigation and governance

G1. Category-specific mitigation assessment

Ranking rule: rank only alternatives tested on a shared baseline and compatible boundary/unit/category/method. The literature retrieved does not support one numerical ordering of all carbon levers, or of all water levers. The table reports the local ordering that can be defended and explicitly leaves incompatible cases unranked. No overall environmental score or unsourced weighting scheme is used.

The practical research priority is paired before/after accounting that measures the relevant endpoint. Recording adoption, certification or installed equipment alone would not establish an environmental benefit.

G2. Rules as of September 6, 2026

These are research findings about named instruments, not a complete compliance guide. Rule existence, reported compliance and measured environmental effectiveness are distinct.

Official links: CA adopted rule and documents, CA regulations compilation, DPR guidance, DPR product list, Water Boards policy, MA CCC energy, Illinois consolidated act, Health Canada changes.

G3. Certification and marketing

Sources: Sun+Earth program, CCOF partnership, Clean Green FAQ, Envirocann program distinctions, CDFA OCal. Providers have institutional interests in certification adoption; that context does not invalidate inspectable criteria, but criteria and achieved effects remain separate claims.

H. Boundary map, evidence map and public-claim tests

H1. Eleven-field provenance records for retained quantitative figures

The fields are: G geography; T period; P population; M metric; FU functional unit/denominator; S system; B product/observation boundary; Method data/model; Bias directional or otherwise unresolved bias; Confidence editor pending; 11 category + characterization + allocation. The confidence field applies explicitly to every row: editor assessment pending; no final confidence assigned. Reported uncertainty is recorded in Bias/Method where available. Numbers lacking applicable characterization/allocation are boundary-orphaned for comparison, even when useful to document a historical claim.

No other numerical environmental effect is promoted in this report. Publication years, sample descriptions and regulatory dates are identifiers/context, not additional footprint estimates. The main text deliberately uses qualitative findings for studies whose quantitative records could not be completed.

H2. Three-class evidence map and gaps

H3. Pre-registered public claims

Source register and access record

Each key denotes one bibliographic object; repeat citations do not add independent evidence. DOI links are stable identifiers. “Partial” means specified metadata or full-method verification remains incomplete, not that a title was completed from memory.

Energy, LCA and comparator sources

• E1. Summers, H.M.; Sproul, E.; Quinn, J.C. (2021). The greenhouse gas emissions of indoor cannabis production in the United States. Nature Sustainability 4:644–650. DOI. Publisher abstract/metadata and inherited ledger; full supplement not audited.
• E2. Desaulniers Brousseau, V.; Goldstein, B.P.; Sedlock, C.; Lefsrud, M. (2024). Environmental Impact of Outdoor Cannabis Production. ACS Agricultural Science & Technology 4(7):690–699. DOI, PMC. Indexed primary full-text passages inspected; direct access intermittently blocked; supplement not recovered.
• E3. Desaulniers Brousseau, V.; Goldstein, B.P.; Lachapelle, M.; Tazi, I.; Lefsrud, M. (2024). Greener green: The environmental impacts of the Canadian cannabis industry. Resources, Conservation and Recycling 208:107737. DOI, author-university record. Abstract/author record and indexed text; full methods not re-audited.
• E4. Mills, E. (2012). The carbon footprint of indoor Cannabis production. Energy Policy 46:58–67. DOI. Journal identity/abstract and accessible paper copy; historical provenance exception.
• E5. Mills, E. (2025). Energy-intensive indoor cultivation drives the cannabis industry’s expanding carbon footprint. One Earth 8(3):101179. DOI. Indexed publisher and author record; already inherited in R05.
• E6. Bottem, R. (2025). Comparative Life Cycle Assessment of Cannabis Production Systems in Washington State. Western Washington University master’s thesis, May. Repository. University record and author-uploaded text inspected; not a journal article. Allocation and calculation reconciliation remain open.
• E7. Das, P.C.; Li, X.; Baik, O.-D.; Tabil, L.G. (2026). Environmental footprint of cannabis production: life cycle assessment-driven evaluation of pretreatment and drying strategies. International Journal of Sustainable Engineering 19(1):2619296. DOI. Published February 9; indexed full-text methods/results, direct publisher access blocked.
• E8. Kalkušová, A.; Neumann, J.; Veselovská, N.; Kůrková, E.; Konvalina, P.; Neugschwandtner, R.W.; Bernas, J. (2025). Rethinking Efficiency: How Increased Electricity Use Can Reduce Environmental Impacts in Controlled Hemp Cultivation—A Life Cycle Assessment (LCA) Study. Agronomy 15(10):2400. DOI. Indexed methods; full direct access rate-limited. Adjacent hemp; underlying trial should not be counted again as independent evidence.
• E9. Chaiyat, N.; Klancoowat, W. (2023). Thermal, energy, economic, and environmental analysis of a smart wastewater recovery system for indoor Cannabis production. Sustainable Technology and Entrepreneurship 2(1):100033. DOI, author laboratory record. Author identity corroborated by laboratory; indexed primary apparatus/results read. LCIA and allocation verification partial.
• E10. New Frontier Data, Resource Innovation Institute and Scale Microgrid Solutions (2018). The Cannabis Energy Report. Primary report. Report accessed; industry-associated reporting/extrapolation, used for provenance rather than a current benchmark.
• E11. Mills, E. (2025). The emergence of indoor agriculture as a driver of global energy demand. npj Sustainable Agriculture 3:52. DOI. Published September 23, 2025; indexed full text. Cross-crop synthesis, already represented in R05; not an independent cannabis measurement.
• X1. Rivas-Aybar, D.; John, M.; Biswas, W. (2023). Environmental Life Cycle Assessment of a Novel Hemp-Based Building Material. Materials 16(22):7208. DOI. Primary full-text/metadata; Western Australian board, area-of-board unit, cradle-to-gate. Industry-linked funding; used only to test transfer of storage claims.

Water sources

• W1. Bauer, S.; Olson, J.; Cockrill, A.; van Hattem, M.; Miller, L.; Tauzer, M.; Leppig, G. (2015). Impacts of Surface Water Diversions for Marijuana Cultivation on Aquatic Habitat in Four Northwestern California Watersheds. PLOS ONE 10(3):e0120016. DOI. Full text; ordinance provenance verified in methods.
• W2. Carah, J.K. et al. (2015). High Time for Conservation: Adding the Environment to the Debate on Marijuana Liberalization. BioScience 65(8):822–829. DOI, author-hosted paper. Full paper; underlying grape source not separately audited. Author list abbreviated here, not an additional source.
• W3. Dillis, C.; Grantham, T.; McIntee, C.; McFadin, B.; Grady, K. (2019). Watering the Emerald Triangle: Irrigation sources used by cannabis cultivators in Northern California. California Agriculture 73(3–4):146–153. DOI. Full text.
• W4. Dillis, C.; McIntee, C.; Butsic, V.; Le, L.; Grady, K.; Grantham, T. (2020). Water storage and irrigation practices for cannabis drive seasonal patterns of water extraction and use in Northern California. Journal of Environmental Management 272:110955. DOI. Abstract verified; full methods not comprehensively inspected.
• W5. Dillis, C.; Butsic, V.; Georgakakos, P.; Portugal, E.; Grantham, T.E. (2023). Water demands of permitted and unpermitted cannabis cultivation in Northern California. Environmental Research Communications 5:025005. DOI. Indexed methods/author record; direct publisher opening blocked.
• W6. Dillis, C.; Baruch, E.; Grantham, T.E. (2026). Contextualizing cannabis water demand and potential for streamflow impacts relative to residential and agricultural users in Northern California. PLOS Water 5(4):e0000515. DOI, data. April 22; full text. CDFW-funded work with agency coauthor; no reported conflict.
• W7. Denton, G.M.; Clulow, A.; Hill, T.R.; Gokool, S.; Kunz, R. (2025). Water use and productivity of Cannabis sativa L., KwaZulu-Natal Midlands, South Africa. Journal of Cannabis Research 7:64. DOI. August 29; full text; floral hemp.
• W8. Büser, C.; Hartung, J.; Graeff-Hönninger, S. (2025). Subsurface drip irrigation reduces weed infestation and irrigation water use while increasing inflorescence and cannabinoid yield in an outdoor tunnel Cannabis sativa L. production system. Journal of Cannabis Research 7:41. DOI. July 10; full text.
• W9. Crispim Massuela, D.; Munz, S.; Hartung, J.; Pieters, A.; Asch, F.; Graeff-Hönninger, S. (2026). Less water, same buds: moderate drought as a water-saving strategy for indoor cannabis. Frontiers in Plant Science 17:1930650. DOI. September 3; full text; eligible at cutoff.
• W10. PG&E Code Readiness, project CR22PGE0101-1 (2022–24 project). Controlled Environment Horticulture: Energy Consumption and Environmental Control Field Study. ETCC. First-party summary only; exact report publication date/full author tuple partial.

Land and wildlife sources

• L1. Butsic, V.; Brenner, J.C. (2016). Cannabis (Cannabis sativa or C. indica) agriculture and the environment: a systematic, spatially-explicit survey and potential impacts. Environmental Research Letters 11:044023. DOI. Abstract/agency version; original observation period not verified here.
• L2. Wang, I.J.; Brenner, J.C.; Butsic, V. (2017). Landscape expansion/deforestation and fragmentation study. Frontiers in Ecology and the Environment. DOI. Partial citation: conflicting title strings in retrieved author/citing records; exact title/pages need publisher confirmation. No numerical multiplier used.
• L3. Dillis, C.; Polson, M. (2026). Patterns and correlates of unlicensed cannabis cultivation in California (USA) following adult-use legalization. International Journal of Drug Policy 155:105412. DOI. Online July 3; September issue. Primary abstract; full coefficients not inspected.
• L4. Gabriel, M.W. et al. (2012). Anticoagulant rodenticides on our public and community lands: spatial distribution of exposure and poisoning of a rare forest carnivore. PLOS ONE 7(7):e40163. DOI. Primary/agency records; author list abbreviated.
• L5. Gabriel, M.W. et al. (2015). Patterns of Natural and Human-Caused Mortality Factors of a Rare Forest Carnivore, the Fisher (Pekania pennanti) in California. PLOS ONE 10(11):e0140640. DOI. Full text; surveillance overlap with L4.
• L6. Wengert, G.M.; Higley, J.M.; Gabriel, M.W.; Rustigian-Romsos, H.; Spencer, W.D.; Clifford, D.L.; Thompson, C.M. (2021). Distribution of trespass cannabis cultivation and its risk to sensitive forest predators in California and Southern Oregon. PLOS ONE 16(9):e0256273. DOI. Full text.
• L7. Hofstadter, D.F. et al. (2021). High rates of anticoagulant rodenticide exposure in California Barred Owls are associated with the wildland–urban interface. Ornithological Applications 123:duab036. DOI. Primary agency/full-text record; author list abbreviated.
• L8. Parker-Shames, P.; Xu, W.; Rich, L.; Brashares, J.S. (2020). Coexisting with cannabis: wildlife response to marijuana cultivation in the Klamath-Siskiyou Ecoregion. California Fish and Wildlife, cannabis special issue. DOI. Partial pagination: conflicting page spans in retrieved citations; primary identifier retained; abstract/author summary inspected.
• L9. Parker-Shames, P.; Goldstein, B.R.; Brashares, J.S. (2024). Spatial and temporal activity of wildlife on and surrounding cannabis farms. The Stacks 24003. DOI, full text. Primary text; shared-data caution with L8.

Chemicals and air sources

• C1. Westmoreland, F.M.; Bugbee, B. (2022). Sustainable Cannabis Nutrition: Elevated root-zone phosphorus significantly increases leachate P and does not improve yield or quality. Frontiers in Plant Science 13:1015652. DOI. November 17; full text and parent spot-check; industry funding disclosed.
• C2. Medel, I.D.; Gabriel, M.W.; Wengert, G.M.; Filigenzi, M.S.; Clifford, D.L. (2022). Passive monitoring of soluble pesticides linked to cannabis cultivation: a multi-scale analysis. Water Quality Research Journal 57(4):233–246. DOI, author-organization paper. Full paper; exact calendar sampling period not extracted, so no numerical result retained.
• C3. Black, G.P.; De Parsia, M.; Uychutin, M.; Gabriel, M.W.; Medel, I.; Wengert, G.; Raines, C.D.; Kolpin, D.W.; Hubbard, L.E.; Hladik, M.L. (2025). Identifying organic contaminants at trespass cannabis grows on federal land in California, USA. Science of the Total Environment 1002:180576. DOI, USGS. Primary abstract; complete methods not audited.
• C4. Wang, C.-T.; Wiedinmyer, C.; Ashworth, K.; Harley, P.C.; Ortega, J.; Rasool, Q.Z.; Vizuete, W. (2019). Potential regional air quality impacts of cannabis cultivation facilities in Denver, Colorado. Atmospheric Chemistry and Physics 19:13973–13987. DOI. Full text.
• C5. Urso, K.; Frazier, A.; Heald, S.; Khlystov, A. (2022). Terpene exhaust emissions and impact ozone modeling from cannabis plants at commercial indoor cultivation facilities in Colorado. Journal of the Air & Waste Management Association 72(8):828–848. DOI, primary abstract. Abstract and parent spot-check; agency/research-institute authors; full model specification not inspected.
• C6. Urso, K.; Vizuete, W.; Moravec, R.; Khlystov, A.; Frazier, A.; Morrison, G. (2023). Indoor monoterpene emission rates from commercial cannabis cultivation facilities in Colorado. Journal of the Air & Waste Management Association 73(4):321–332. DOI. Full text; calculations and sensitivity, not direct exhaust measurements.

Official governance/program sources are identified with titles, jurisdictions, dates where available and direct links in G2/G3; those live records were accessed September 6, 2026.

Located records awaiting extraction or identity completion

• Parker-Shames, P. (2022), dissertation: Berkeley-hosted PDF. Experimental light/noise work located; title/chapters and results not fully extracted. No effect magnitude claimed.
• Franklin et al. (2018), Grass is not always greener: Rodenticide exposure of a threatened species near marijuana growing operations. USGS record. Partial author/venue tuple; case study not used for prevalence.
• Gabriel et al. (2018), Exposure to rodenticides in Northern Spotted and Barred Owls on remote forest lands in northwestern California: evidence of food web contamination. Avian Conservation and Ecology 13(1):2. DOI. Full access failed; not quantified here.
• Thompson et al. (2014), Impacts of Rodenticide and Insecticide Toxicants from Marijuana Cultivation Sites on Fisher Survival Rates in the Sierra National Forest, California. Conservation Letters 7(2):91–102. DOI. Located through references; full source not independently read.
• ETCC, Controlled Environment Horticulture (CEH) Field Study: Adaptive Daylighting Controls. Project record. Greenhouse field work located, dates/methods not fully extracted; no effect claim.
• McGill Max Bell Policy Lab (2020), Akeileh, Moyer, Sim and Vissandjee Amarsy, Chronic Waste. Institutional summary. Packaging estimate provenance incomplete; not retained as measured mass.

Fifteen priority sources for editorial verification

This is a reading priority list with reliability/institutional notes, not final evidence grades.

Editorial gaps and next verification priorities

1. Recover E2/E6/E7 supplements or complete methods before importing any carbon magnitude into a cross-study table. Check characterization version, coproduct allocation, product moisture and precise endpoints. Q10/Q11 remain explicitly provisional.
2. Obtain W10’s complete report and close a commercial water balance. Separately identify external supply, reused condensate, RO reject, nutrient effluent and vapor export.
3. Extract the located light/noise dissertation and unresolved wildlife records before claiming an absence of causal disturbance research. Resolve L2 title and L8 pagination.
4. Seek representative licensed-farm pesticide-fate monitoring, nitrogen discharge/soil emissions, and receiving-water outcomes. Consumer residues and nutrient prescriptions do not close these gaps.
5. Obtain matched occupied-area/agricultural-area denominators and current production-system shares; do not substitute license capacity or enforcement detections.
6. Recover transparent media/plastics/biomass/packaging mass flows and disposal counterfactuals. Canadian waste reporting changes require a break in trend interpretation.
7. Locate causal policy/certification evaluations and modern air inventories beyond Colorado. Standards and certifications currently support program-description claims more readily than quantified outcome claims.

Candidate claims for editorial review

Temporary labels below are not R04-C identifiers. Every candidate inherits its cited record’s access limitations; final evidence status/confidence is intentionally unassigned. Quantitative candidates reference H1 for the complete boundary and method fields.

Search-stopping statement

Cutoff: September 6, 2026. Searches used the web index to reach PubMed/PMC, PLOS, Frontiers, Springer/Journal of Cannabis Research, IOP, ACS, Nature, ScienceDirect, Taylor & Francis, university repositories, UC Berkeley’s Cannabis Research Center, USGS/Forest Service, ETCC and official regulatory/program sites. These were web-indexed searches and direct source reads, not exhaustive native Scopus or Web of Science searches. English publications were prioritized. Eligible sources were primary empirical/model studies, theses clearly labeled as such, first-party technical reports and official current rules. Reviews and vendor material aided discovery; unsupported magnitudes were not admitted as findings.

Query families actually covered included cannabis cultivation life cycle assessment 2025/2026; Bottem Washington LCA; Brousseau outdoor ReCiPe media; cannabis drying LCA; cannabis energy 1% Mills; cannabis joint driving EUDA; Bauer 22.7 liters; Carah wine grapes; Dillis water storage 2020/2023/2026; cannabis evapotranspiration 2025; indoor complete water balance condensate reverse osmosis; cannabis landscape fragmentation; wildlife rodenticide Gabriel 2012/2015; cannabis greenhouse light pollution noise fencing wildlife; cannabis BVOC ozone Wang/Urso; nutrient leachate phosphorus/nitrogen; pesticide environmental fate legal/trespass 2024–2026; cannabis packaging waste LCA; CO₂ enrichment emissions; and named jurisdictional rules/certification programs. Citation following tested the ordinance/water lineage, shared Dillis models, reused LCA inventory and wildlife surveillance overlap.

The search stopped after the required categories had primary support or explicit limitations, recurring results largely returned the same source families, and remaining gaps required full-method retrieval, dataset work or a separate targeted review rather than more repetition of general searches. Saturation was strongest for the named water-provenance and LCA families; it was not established for every international jurisdiction, non-English source, light/noise experiment or industrial-hemp LCA.

Searched and no eligible fully verified evidence located: representative integrated commercial indoor water balance; transparent representative retail-packaging LCA; complete national cannabis waste/land-share inventory on matched denominators; universal cross-product dose/revenue comparison; causal certification/policy footprint evaluation. These are properties of this search, not claims that such evidence cannot exist.

Located but incomplete: the listed dissertation, older wildlife papers, daylighting report, LCA supplements and downstream residue studies. Not comprehensively searched: non-English literature, all hemp seed/fiber product LCAs, every local ordinance, global illicit-area surveys, and general horticultural light/noise literature. These limitations should remain visible during critique rather than being converted into claims of literature absence.