On current trends, higher CO2 concentrations could reduce iron, zinc and protein levels in the crops that feed the world by up to 17 percent by mid-century, they reported in the journal Nature Climate Change.

“Hundreds of millions of people could become newly deficient in these nutrients, primarily in Africa, Southeast Asia, India and the Middle East,” lead author Matthew Smith, a researcher at the Harvard T.H. Chan School of Public Health, told AFP.

“These are in addition to the billions of people already deficient that could see their condition worsen.”

via Burning Coal, Gas & Oil putting Millions at Risk of Starving