Global warming

Associated Press
In this Feb. 5, 2012 file photo, people walk in the South Chagrin Reservation Metropark on a sunny and mild afternoon in Bentleyville, Ohio. A new poll shows Americans' belief in global warming is on the rise, along with temperatures and surprising weather changes. The survey by the University of Michigan and Muhlenberg College says 62 percent of those asked last December think the Earth is getting warmer. That's an increase from 55 percent in the spring of that year. It's the highest percentage in two years. (AP Photo/Amy Sancetta, 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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