CBS: The nutritional quality of food crops may be at risk if climate change intensifies, according to a recent study. In a wheat field test, scientists found that elevated carbon dioxide may inhibit plants' assimilation of nitrate into proteins. The findings were published online in the journal Nature Climate Change on April 6. "Food quality is declining under the rising levels of atmospheric carbon dioxide that we are experiencing," said lead author Arnold Bloom, a professor in the Department of Plant...