Global warming

Associated Press
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)

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Global warming is leading to such severe storms, droughts and heat waves that nations should prepare for an unprecedented onslaught of deadly and costly weather disasters, an international panel of climate scientists said in a report issued earlier this year.

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