FILE - 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)

Associated Press
FILE - 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)
FILE - 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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