Rising carbon levels in the atmosphere can make plants grow faster, but there's another hidden consequence: they rob plants of the nutrients and vitamins we need to survive. In a talk about global food security, epidemiologist Kristie Ebi explores the potentially massive health consequences of this growing nutrition crisis -- and explores the steps we can take to ensure all people have access to safe, healthy food.<img alt="" height="1" src="http://feeds.feedburner.com/~r/TedtalksHD/~4/l_pti0-p9NQ" width="1" />