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A fifth of global farmland contaminated by toxic metals, says study

April 15, 2025
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Nearly a fifth of the world’s agricultural land is contaminated by toxic metals, posing a serious threat to food security, public health, and ecosystems, according to a new global study published on 15 April in the journal Science. Researchers have mapped soil pollution at an unprecedented scale, finding that more than 17% of cropland is affected by dangerous levels of metals such as arsenic, lead, and cadmium.

The study, which used data from nearly 800,000 soil samples from around the world, identified a previously unrecognised high-risk zone stretching across southern Europe, the Middle East, and South Asia. The contamination is linked to both natural geological processes and centuries of industrial activity, including mining and smelting.

With up to 1.4 billion people living in polluted regions, experts warn that toxic metals in soil can enter the food chain, harming biodiversity and exacerbating poverty. “Soil pollution is not just an environmental issue—it directly affects human health and global food security,” said Rothamsted’s Professor Steve McGrath, who was part of the multi-institute research team led by Tsinghua University in Beijing, China.

The findings come at a time of growing concern over soil degradation, particularly as demand for critical metals increases due to the transition to green energy technologies like electric vehicle batteries and solar panels. The researchers call for urgent international action, including targeted funding for pollution monitoring and soil restoration, particularly in data-poor regions such as Africa and Russia.

Toxic-soils-map-of-the-world

The study also highlights the limitations of existing data, with many remote areas lacking sufficient soil sampling. While the researchers used machine learning to fill in gaps, they stress that more detailed, site-specific studies are needed to develop effective solutions.

With toxic metal pollution set to rise, the researchers urge policymakers to take immediate action. “Protecting our soils is as important as protecting our air and water. Without clean soil, we cannot produce safe food,” added McGrath.

The study adds to growing global concern over the hidden dangers of soil pollution, reinforcing calls for stricter environmental regulations and sustainable land management practices.

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