Major category error from Harvard Philosophy concentrator.
Matthew Yglesias writes
"Given what we’ve learned about the risks of catastrophic climate change, it  seems like a concept that’s been somewhat overtaken by events. A carbon tax, or a cap on greenhouse gas emissions with auctioned permits, would constitute a tax on gasoline among other things. And there’s no particular reason that burning fuel in a car should be disfavored versus other carbon-intensive activities."
via Kevin Drum
The fact that there is a reason to tax both coal and petroleum consumption does not mean that "there is no patricular reason that burning fuel in a car should be disfavored compared to other carbon-intensive activities." A newly understood problem with petroleum consumption doesn't eliminate that many excellent longer understood reasons to limit petroleum consumption. It can't. A newly discovered problem with burning gasoline and other things can't eliminate the case that burning gasoline is worse. A positive number plus a constant is greater than 0 plus a constant.
Those of us who are roughly twice Yglesias's age remember the original logic of a gasoline tax, which was designed to reduce dependence on foreign oil. That argument is, for some reason, out of fashion, but it is much more compelling now than it was then.
The fact that we have a new concern -- global warming -- which will be partially addressed by a gasoline tax isn't and can't be a reason why burning fossile fuels in cars isn't particularly bad. The case for a carbon tax as opposed to a carbon tax plus a gasoline tax is that there is no problem with gasoline consumption except for global warming.
It is odd that criticism of this nonsensical position from the author of dozens of "peak oil" posts is so measured.
A gasoline tax will reduce global warming, reduce depletion of petroleum reserves and cause the price of petroleum to fall. It is fairly likely that the cost will be entirely born by oil exporting countries and not at all by -- well us.
If one opposes a gasoline tax, one should logically advocate aid for Kuwait Saudi Arabia and Russia. If that sounds crazy then so is the current minimal US gasoline tax.