(Bloomberg) Barack Obama may consider introducing a tax on carbon emissions to help cut the U.S. budget deficit after winning a second term as president, according to HSBC Holdings Plc.

A tax starting at $20 a metric ton of carbon dioxide equivalent and rising at about 6 percent a year could raise $154 billion by 2021, Nick Robins, an analyst at the bank in London, said today in an e-mailed research note, citing Congressional Research Service estimates. “Applied to the Congressional Budget Office’s 2012 baseline, this would halve the fiscal deficit by 2022,” Robins said.

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