2013: Year in Review by National Geographic. Part 3/3

Nitrogen fertilizer has shaped our planet. The crops we depend on for survival – corn, wheat, and rice – are grown using a hundred million tons of the stuff each year. But its toll on water, air, and wildlife is steep. As Dan Charles writes in the May issue of National Geographic, “runaway nitrogen is suffocating lakes and estuaries, contaminating groundwater, and even warming the globe’s climate. As a hungry world looks ahead to billions more mouths needing nitrogen-rich protein, how much clean water and air will survive our demand for fertile fields?” (Photo by Peter Essick/National Geographic)
2013: Year in Review by National Geographic. Part 3/3
   
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