In this Thursday, Aug. 9, 2012 file photo, Jerry Johnson of Ashland uses his antique 57 Ford tractor to mow vegetation around his drying pond in Ashland, Neb. Delegates from nearly 200 countries are ... more 
In this Thursday, Aug. 9, 2012 file photo, Jerry Johnson of Ashland uses his antique 57 Ford tractor to mow vegetation around his drying pond in Ashland, 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) less 
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Associated Press | Photo By Nati Harnik, File
Wed, Nov 28, 2012 6:51 AM EST