FILE - In this Sept. 19, 2012 file photo, corn plants weakened 

FILE - In this Sept. 19, 2012 file photo, corn plants weakened by the drought lie on the ground after being knocked over by rain in Bennington, Neb. Delegates from nearly 200 countries are meeting in the Qatari capital of Doha to discuss ways slowing climate change, including by cutting emissions of greenhouse gases that scientists say are warming the planet, melting ice caps, raising sea levels, and changing rainfall patterns with impacts on floods and droughts. (AP Photo/Nati Harnik, File)
Associated Press
FILE - In this Sept. 19, 2012 file photo, corn plants weakened by the drought lie on the ground after being knocked over by rain in Bennington, Neb. Delegates from nearly 200 countries are meeting in the Qatari capital of Doha to discuss ways slowing climate change, including by cutting emissions of greenhouse gases that scientists say are warming the planet, melting ice caps, raising sea levels, and changing rainfall patterns with impacts on floods and droughts. (AP Photo/Nati Harnik, File)
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