Just wait, all of the liberal theories about social responsibility and their attempts to prevent people from harming themselves (tobacco, obesity, guns, environment) will all one day coalesce into a crazy singular notion like carbon rationing.
Imagine, each human being could be alloted a certain amount of carbon credits to spend over their lifetime in the form of food, transportation, entertainment, etc. If you go over your amount - like get too fat or travel too much - you'll be fined (taxed) severely or even cut-off. Sound crazy? I bet there are folks in D.C. on both sides of the aisle that might find this idea appealing. I hope they don't read about it here...
Oh, for the record, I don't think that all forms of carbon credits are a bad idea and if done' properly, would be a fine standardized currency for taking care of the environment. I doubt that there are many on this forum who in addition to enjoying their FJ, also care about the natural environment very much. Am I wrong?