Thousands of acres of US forests sprayed with cancer-linked chemical have become a growing environmental concern as reports show glyphosate, the active ingredient in Roundup, has been used across forest lands in California and other US states. The herbicide is commonly sprayed after fires or logging to clear native shrubs, grasses, and wildflowers so commercially valuable conifer trees can grow with less competition.

The US Forest Service has used herbicides in forest management for decades, especially in areas where timber production is a major economic activity. Supporters argue that glyphosate helps manage competing vegetation and supports faster regrowth of trees used for lumber, paper, and construction. Critics say the practice damages recovering ecosystems and turns diverse post-fire landscapes into simplified tree plantations.

Why Glyphosate Is Controversial

Glyphosate is one of the most widely used herbicides in the US. The International Agency for Research on Cancer, part of the World Health Organization, classified glyphosate as “probably carcinogenic to humans” in 2015, based on limited human evidence and stronger evidence from animal studies.

However, the US Environmental Protection Agency maintains that glyphosate products, when used according to label directions, do not pose risks to children or adults and says it has found no evidence that glyphosate causes cancer in humans.

Key Data and Developments

Environmental Concerns Around Forest Spraying

• Native vegetation loss: Glyphosate can remove shrubs, grasses, wildflowers, and other plants that naturally return after wildfires.
• Biodiversity decline: These plants support insects, birds, small mammals, pollinators, and sensitive species that depend on mixed habitats.
• Water contamination risk: A USGS study found glyphosate at least once in 66 of 70 US streams and rivers sampled across different land-use settings.
• Runoff concerns: Scientists and activists worry that repeated spraying can move glyphosate and its breakdown product AMPA into surrounding waterways.
• Post-fire ecosystem impact: Critics argue that spraying after fires can interfere with natural forest recovery and reduce habitat complexity.

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Legal Pressure Around Roundup

Glyphosate remains at the center of major US litigation. The Supreme Court is currently considering Monsanto v. Durnell, a case focused on whether federal pesticide law prevents state-level failure-to-warn lawsuits over Roundup. The case involves claims that glyphosate exposure contributed to lymphoma, while Monsanto argues EPA-approved labels should override state claims.

Bayer, which acquired Monsanto, has faced thousands of Roundup-related lawsuits. The company continues to deny that glyphosate causes cancer, while plaintiffs argue users should have been warned about potential risks.

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Final Takeaway

The outrage over US forests sprayed with cancer-linked chemical is not just about weed control. It sits at the intersection of timber production, ecosystem recovery, public health, water quality, and corporate liability. With regulators, courts, scientists, and communities still divided, the future of glyphosate use in forest management remains highly contested.

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