Wheat fields like this one could yield wheat with less zinc and iron in the future if they are exposed to higher levels of CO2, according to the journal Nature.
May 8, 2014 When crops are surrounded by high levels of carbon dioxide, they're more productive. But they may have lower concentrations of some crucial nutrients, which could increase malnutrition in the future.
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The density of fast-food joints where we live, work and commute could be a problem for our waistlines.
David McNew/Getty Images
March 14, 2014 The more fast food you encounter where you live and work, the likelier you are to be obese, research shows. That suggests policies limiting fast-food outlets in neighborhoods may be onto something.
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