David Roberts says yes:

This may piss off some people I respect a great deal. Nonetheless, after hearing it in several off-the-record conversations in D.C. last week, I believe it's something that needs to be said publicly:

The 111th U.S. Congress is not going to pass a carbon tax. Calls for a carbon tax, to the extent they have any effect, will complicate and possibly derail passage of carbon legislation.

It's possible that a carbon tax (and/or cap-and-dividend) bill will be introduced. One or both might even make it to a full vote, though I doubt it. But they won't pass. If you want carbon pricing out of this Congress, cap-and-trade is what you're getting. It follows that your energies are best spent ensuring that cap-and-trade legislation is as strong as possible.

Them's the facts.

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