AGRICULTURE: Rising CO2 emissions may lower food value of crops Tiffany Stecker, E&E reporter Published: Thursday, May 8, 2014 A carbon dioxide-rich atmosphere could strip important food crops of their nutrients, a new study suggests. Please subscribe to ClimateWire to read the full story. Username: Password: Forgot your access codes? Recover them. Not a subscriber? Sign up for a trial. Ready to subscribe? Click here.