FILE - This 2003 file photo released by Subhankar Banerjee shows a polar bear walking in the Arctic National Wildlife Refuge in Alaska. Since an agreement to reduce greenhouse gas pollution was signed in Kyoto, Japan, in Dec. 1997, the level of carbon dioxide in the air has increased 6.5 percent. Officials from across the world will convene in Copenhagen next month to seek a follow-up pact, one that President Barack Obama says 'has immediate operational effect...an important step forward in the effort to rally the world around a solution.' (AP Photo/Subhankar Banerjee, File)AP - Since the 1997 international accord to fight global warming, climate change has worsened and accelerated — beyond some of the grimmest of warnings made back then.


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