Rising carbon dioxide emissions are set to make the world’s staple food crops less nutritious, according to new scientific research, worsening the serious ill health already suffered by billions of malnourished people. The surprise consequence of fossil fuel burning is linked directly to the rise in CO levels which, unlike some of the predicted impacts of climate change, are undisputed. The field trials of wheat, rice, maize and soybeans showed that higher CO levels significantly reduced the levels of the essential nutrients iron and zinc, as well as cutting protein levels. “We found rising levels of CO are affecting human nutrition by reducing levels of very important nutrients in important food crops,” said Prof Samuel Myers, an environmental health expert at Harvard University, Boston, and lead author of the study. “From a health viewpoint, iron and zinc are hugely important.”

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