Nearly 17% of the world’s croplands are contaminated with “heavy metals”, according to a new study in Science. These contaminants – arsenic, cadmium, lead, and others – may be invisible to the eye, but they threaten food safety and human health.
Heavy metals and metalloids are elements that originate from either natural or human-made sources. They’re called “heavy” because they’re physically dense and their weight is high at an atomic scale.
Heavy metals do not break down. They remain in soils for decades, where crops can absorb them and enter the food chain. Over time, they accumulate in the body, causing chronic diseases that may take years to appear. This is not a problem for the distant future; it’s already affecting food grown today.
