The World Health Organization’s cancer research agency has classified atrazine – the second most widely used herbicide in the United States – as “probably carcinogenic to humans,” adding to growing concerns about toxic exposures in the nation’s farm belt.

Professor Michael Antoniou, head of the Gene Expression and Therapy Group at King’s College London, describes how regulators are ignoring the health risks of stacked-trait GMOs and the combined toxicity of pesticide mixtures.