Independent: Some of the worlds most important staple crops could be rendered less nutritious by rising levels of carbon dioxide in the atmosphere, scientists have said, leading to a rise in dietary deficiencies already responsible for hundreds of thousands of deaths annually.
Crops such as wheat, rice and soybeans were all found to have decreased concentrations of iron and zinc when exposed to the higher levels of CO2. Experts said that the effect, which has been observed before but never conclusively proven...