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Rising Greenhouse Gases Making Food Less Nutritious

Temperatures around the world are rising as humans burn coal, oil and other fossil fuels for energy. Burning those fuels releases heat-trapping carbon dioxide into the atmosphere. But it does more than that. CO2 is vital for plant growth. While having more of it sounds like a good thing, scientists are finding it is not always that simple. VOA's Steve Baragona has more.

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