The lack of a global treaty with emissions targets at the conclusion of the U.N. climate summit will make it more difficult for U.S. lawmakers to enact climate legislation with a cap-and-trade mechanism, according to this article. Sen. John Kerry, D-Mass., said that in lieu of cap and trade, a compromise bill may contain options such as carbon taxes and mandates for clean-energy producers. Another approach could have a "cap-and-dividend" program that auctions pollution permits and gives the proceeds to the public.

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