FILE - In this Thursday, Sept. 6, 2012 file photo, a combine harvests corn near Bennington, Neb. Delegates from nearly 200 countries are meeting in the Qatari capital of Doha to discuss

 

              FILE - In this Thursday, Sept. 6, 2012 file photo, a combine harvests corn near Bennington, Neb. Delegates from nearly 200 countries are meeting in the Qatari capital of Doha to discuss
FILE - In this Thursday, Sept. 6, 2012 file photo, a combine harvests corn near 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)