Glyphosate

By 2023, glyphosate-tolerant genetically modified crops accounted for 91% of U.S. corn, 95% of soybeans, and 94% of cotton [1]. From the late 1970s to 2016, the frequency and volume of glyphosate application increased 100-fold [1].

Glyphosate is the chemical signature of contemporary [[industrial-agriculture|industrial agriculture]]. The wiki names it explicitly as a threat entity because that is what it is — not because herbicides are categorically bad, but because this herbicide at this scale, in this regulatory environment, with these documented effects, has produced harms that the wiki should not euphemize.

Chemistry

IUPAC name: N-(phosphonomethyl)glycine [1] Family: organophosphorus compound Function: broad-spectrum systemic herbicide; also used as a crop desiccant Mechanism: inhibits the plant enzyme EPSP synthase, blocking the shikimate pathway that produces aromatic amino acids (phenylalanine, tyrosine, tryptophan). Without these amino acids, plants cannot synthesize essential proteins, enzymes, or many secondary metabolites. They die over a few days.

The shikimate pathway is present in all green plants and in many bacteria, fungi, and algae. It is absent in animals — the marketing implication is that glyphosate is therefore safe for humans. The wiki should hold this carefully: the pathway is also present in many gut bacteria (which are not animals), and human exposure to glyphosate may affect microbiome composition through this mechanism. The “selectivity” claim is true at the level of human cells; not necessarily at the level of human bodies.

Commercial history

• 1974 — Monsanto brings glyphosate to market under the brand name Roundup [1]
• 1991 — Monsanto’s initial patent expires
• 1996 — Monsanto launches Roundup Ready genetically modified crops — engineered to survive glyphosate application that would otherwise kill them. This is the inflection point. Now farmers could spray glyphosate over entire fields of corn, soybeans, and cotton without harming the crop, killing only the weeds. Adoption explodes.
• September 2000 — Monsanto’s exclusive U.S. rights to the isopropylamine salt expire; generic glyphosate floods [[the-market|the market]]
• 2018 — Bayer acquires Monsanto for $63 billion, taking on Monsanto’s herbicide business and litigation exposure together
• February 2026 — Bayer announces $7.25 billion settlement to resolve pending cancer lawsuits [1]

Scale

By 2023, the U.S. agricultural footprint of glyphosate-resistant crops [1]:

• 91% of corn
• 95% of soybeans
• 94% of cotton

Most of the corn, soy, and cotton in the American food, feed, and fiber supply has glyphosate residue history. The exposure is not optional for consumers without dramatic dietary shifts.

The 100-fold increase in application volume from late 1970s to 2016 [1] is the underlying number. [[industrial-agriculture|Industrial agriculture]]‘s dependence on glyphosate is now structural, not incidental.

The carcinogenicity controversy

The wiki should hold the disagreement honestly rather than collapsing to either side [1]:

• International Agency for Research on Cancer (IARC, WHO) classified glyphosate as “probably carcinogenic to humans” (Group 2A) in March 2015. IARC reviewed mechanistic, animal, and epidemiological evidence; classified based on “limited” human evidence and “sufficient” animal evidence
• U.S. Environmental Protection Agency (EPA) maintains glyphosate is “not likely to be carcinogenic to humans”
• European Food Safety Authority (EFSA) concluded glyphosate is “unlikely to pose a carcinogenic hazard to humans”
• European Union renewed glyphosate authorization for 10 years in November 2023, despite substantial public opposition
• U.S. juries in multiple cases have found in favor of plaintiffs claiming glyphosate exposure caused their non-Hodgkin lymphoma; Bayer’s $7.25 billion settlement (February 2026) suggests sustained legal exposure independent of regulatory positions

The disagreement is genuine. Scientific bodies are weighing similar evidence and reaching different conclusions, partly because of methodological choices about which evidence to weight more heavily and partly because of (well-documented) industry influence on some of the regulatory science.

The wiki should not pretend this is settled in either direction. The IARC classification, EPA position, jury verdicts, and ongoing settlements are all real. Reasonable readers can hold them together and form judgments.

Documented environmental harms

Beyond the cancer question, the broader environmental ledger [1]:

Pollinator decline

Glyphosate use in U.S. agriculture has cleared milkweed from millions of acres of cropland and field edges. Milkweed is the obligate host plant for [[monarch-butterfly|monarch butterfly]] caterpillars. The clearing is documented as having “contributed to an 81% decline in monarchs” in the Midwest [1]. The mechanism is indirect (glyphosate kills milkweed; no milkweed kills monarchs) but the chain is well-traced.

Other pollinators are affected by similar mechanisms (loss of flowering “weeds” along field edges that supported bee diversity) and by direct toxicity at high exposure levels.

Aquatic toxicity

Glyphosate-based formulations containing POEA surfactants pose specific risks to amphibians, causing “developmental malformations of the tail, mouth, eye and head” [1]. The active ingredient (glyphosate proper) is less aquatically toxic than some of the surfactants used in commercial Roundup formulations.

Soil biota

The picture here is more contested. A 2016 meta-analysis concluded that “at typical application rates glyphosate had no effect on soil microbial biomass or respiration” [1]. Other research has found significant effects on specific microbial communities, particularly [[mycorrhizal-fungi|mycorrhizal fungi]] (which are central to soil-plant nutrient exchange). The honest reading: bulk soil microbial mass is not dramatically affected at typical rates, but specific communities and functions may be.

Herbicide resistance

The defining failure mode of any herbicide-dependent system: 23 glyphosate-resistant weed species had been documented in 18 countries by 2014 [1]. The number has continued to grow. [[industrial-agriculture|Industrial agriculture]] has responded by introducing crops resistant to additional, more-toxic herbicides (dicamba, 2,4-D), creating an escalating chemical dependence with no end-state.

Why it matters here

Glyphosate is the wiki’s first threat entity — the first entry where the entity’s main relationship to other wiki content is what it harms. Future threat entities (microplastics, neonicotinoids, ultra-processed food, soil compaction, etc.) will follow this template.

For 0mn1.one’s mission, glyphosate is also the most-cited single chemical in the regenerative-agriculture critique of industrial agriculture. The wiki’s [[industrial-agriculture]] entry treats it abstractly; the [[no-till-farming]] entry distinguishes “industrial no-till” (glyphosate-dependent) from “regenerative no-till” (explicitly not). All five featured farms ([[polyface-farm]], [[singing-frogs-farm]], [[browns-ranch]], [[apricot-lane-farms]], [[stone-barns-center]]) operate in part as worked refusals of glyphosate-dependent agriculture.

The wiki should hold this carefully and honestly. Glyphosate has been useful for some real problems; the regulatory and scientific picture is contested; and the documented harms are substantial enough to take seriously regardless of how the cancer question ultimately resolves. The right posture is informed engagement, not dismissal in either direction.

Lenses still to grow

• The Roundup-Ready GMO complex in detail — the technology, the corporate-licensing structure, the farmer-economics consequences
• Specific glyphosate cancer cases (Hardeman, Pilliod, Johnson) — the legal record that has shaped the settlement landscape
• Comparative: dicamba, 2,4-D, paraquat — the next-generation herbicides [[industrial-agriculture|industrial agriculture]] has been turning to as glyphosate resistance spreads
• The Bayer-Monsanto acquisition as a corporate history; the financial consequences for Bayer
• Regulatory politics in detail — the EU 10-year reauthorization vote; the EPA review process; the industry-influence documentation
• Microbiome research specific to glyphosate exposure — the contested clinical-relevance question
• Indigenous and farmworker exposure — the populations at highest direct exposure; the environmental-justice dimension
• Monsanto Papers — the discovery in litigation of internal Monsanto documents; the systematic effort to influence research and regulation

See also

Auto-generated from this entry’s typed relations: frontmatter, grouped by relation type so the editorial signal isn’t flattened.

• Enables: [[industrial-agriculture]]
• Member of: [[threat]]
• Threatens: [[gut-microbiome]]
• Contrasts with: [[natural-farming]] · [[no-till-farming]]
• Enabled by: [[pesticide-treadmill]]

Sources

1. Wikipedia: Glyphosate. IUPAC nomenclature, EPSP synthase / shikimate pathway mechanism, 1974 Monsanto Roundup launch, 1991 patent expiry, 1996 Roundup Ready, 100-fold application increase late 1970s-2016, 2023 GM crop adoption rates (corn 91%, soy 95%, cotton 94%), IARC 2015 Group 2A classification, EPA “not likely carcinogenic” position, EFSA “unlikely” position, EU 2023 10-year reauthorization, February 2026 Bayer $7.25 billion settlement, 2016 [[soil-microbiome|soil microbiome]] meta-analysis, POEA surfactant aquatic toxicity, 81% [[monarch-butterfly|monarch butterfly]] decline contribution, 23 glyphosate-resistant weed species in 18 countries by 2014. https://en.wikipedia.org/wiki/Glyphosate

The Roundup Ready system specifics, individual cancer-case records, the Monsanto Papers discovery, peer-reviewed microbiome-effect literature, and Indigenous/farmworker environmental justice work all warrant primary-source citation as this page is enriched.

All sources retrieved 2026-05-02.