What to know about the battle over lawsuits alleging that Roundup weedkiller can cause cancer
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Roundup
Topics referred to by the same term
A roundup is a systematic gathering together of people or things.
United States Environmental Protection Agency
U.S. federal government agency
The Environmental Protection Agency (EPA) is an independent agency of the United States government tasked with environmental protection matters. President Richard Nixon proposed the establishment of EPA on July 9, 1970; it began operation on December 2, 1970, after Nixon signed an executive order. T...
Bayer
German multinational pharmaceutical and biotechnology company
Bayer AG (English: , commonly pronounced ; German: [ˈbaɪɐ] ) is a German multinational pharmaceutical and biotechnology company and is one of the largest pharmaceutical companies and biomedical companies in the world. Headquartered in Leverkusen, Bayer's areas of business include pharmaceuticals, co...
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Deep Analysis
Why It Matters
This legal battle matters because it affects millions of consumers who use Roundup for gardening and agriculture, potentially exposing them to health risks. It impacts Bayer AG financially, with billions in settlements already paid, and could reshape regulatory standards for pesticide safety testing. The outcome may influence future product liability cases and how companies disclose potential health risks of widely used chemicals.
Context & Background
- Roundup, containing glyphosate, was introduced by Monsanto in 1974 and became the world's most widely used herbicide
- The International Agency for Research on Cancer (IARC) classified glyphosate as 'probably carcinogenic to humans' in 2015, sparking controversy
- Bayer acquired Monsanto in 2018 for $63 billion, inheriting thousands of Roundup lawsuits
- Previous major settlements include Bayer's $10.9 billion agreement in 2020 to resolve most U.S. claims, though thousands of cases remain
What Happens Next
Upcoming trials will continue through 2024, with Bayer likely facing additional verdicts and settlements. The Supreme Court may eventually review key legal questions about preemption of state failure-to-warn claims by federal pesticide labeling laws. Regulatory agencies worldwide will continue reassessing glyphosate safety, with the EPA's ongoing review expected to conclude in 2026.
Frequently Asked Questions
The primary concern is that glyphosate, Roundup's active ingredient, may cause non-Hodgkin lymphoma and other cancers. Plaintiffs allege long-term exposure increases cancer risk, though regulatory agencies disagree on the level of danger.
Bayer maintains Roundup is safe when used as directed, citing EPA and other regulatory approvals. The company has settled thousands of cases while continuing to defend the product's safety in remaining litigation.
Plaintiffs rely on IARC's classification, internal Monsanto documents suggesting the company knew of risks, and epidemiological studies linking glyphosate to cancer. They also cite alternative weed-killing methods that existed when Roundup was marketed.
Users face uncertainty about long-term health effects and potential liability for exposing others. Some are switching to alternative herbicides, while others continue using Roundup citing its effectiveness and regulatory approvals.
The core claim is failure to warn—that Monsanto knew or should have known about cancer risks but didn't adequately label the product. Some cases also allege defective design and negligence in testing and marketing.