US President Barack Obama's re-election heightens the prospects for some kind of national price on carbon, whether through cap-and-trade or a carbon tax. Either type of legislation would be tricky to push through Congress, which remains split, with Republicans controlling the House of Representatives and Obama's Democratic colleagues the Senate. But in the interim, the president could use the Environmental Protection Agency (EPA) to limit pollution and mandate the use of low-carbon technologies by large stationary polluters.
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