Rising levels of carbon dioxide (CO2) from human activity are making staple crops such as rice and wheat less nutritious and could result in 175 million people becoming zinc deficient and 122 million people becoming protein deficient by 2050.
The study also found that more than 1 billion women and children could lose a large amount of their dietary iron intake, putting them at increased risk of anemia and other diseases.
“Our research makes it clear that decisions we are making every day—how we heat our homes, what we eat, how we move around, what we choose to purchase—are making our food less nutritious and imperiling the health of other populations and future generations,” said Sam Myers, lead author of the study and principal research scientist at Harvard Chan School. The study was published online August 27, 2018 in Nature Climate Change.
Presently, more than 2 billion people worldwide are estimated to be deficient in one or more nutrients. In general, humans tend to get a majority of key nutrients from plants: 63% of dietary protein comes from vegetal sources, as well as 81% of iron and 68% of zinc. It has been shown that higher atmospheric levels of CO2 result in less nutritious crop yields, with concentrations of protein, iron, and zinc being 3%-17% lower when crops are grown in environments where CO2 concentrations are 550 parts per million (ppm) compared with crops grown under current atmospheric conditions, in which CO2 levels are just above 400 ppm.
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