From the WSJ Today--Foreign Carbon taxes

Mr. Chu, speaking before a House science panel, said establishing a carbon tariff would help "level the playing field" if other countries haven't imposed greenhouse-gas-reduction mandates similar to the one President B plans to implement over the next couple of years. It is the first time the administration has made public its view on the issue.

"If other countries don't impose a cost on carbon, then we will be at a disadvantage...[and] we would look at considering perhaps duties that would offset that cost," Mr. Chu said.