This Sept. 16 image released by NASA shows the amount of summer sea ice in the Arctic, at center in white, and the 1979 to 2000 average extent for the day shown, with the yellow line. Scientists say sea ice in the Arctic shrank to an all-time low of 1.32 million square miles on Sept. 16, smashing old records for the critical climate indicator.

This Sept. 16 image released by NASA shows the amount of summer sea ice in the Arctic, at center in white, and the 1979 to 2000 average extent for the day shown, with the yellow line. Scientists say sea ice in the Arctic shrank to an all-time low of 1.32 million square miles on Sept. 16, smashing old records for the critical climate indicator.

View caption NASA/AP

Climate Politics: It's Laugh Lines Vs. 'Not A Joke'

Stymied by Congress early on in his term while trying to advance his climate policies, President Obama has resorted to taking incremental actions that don't need congressional approval. Mitt Romney doesn't mention climate change in his energy plan, and favors cheap energy sources like coal.

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