There is no 'right' number for a carbon tax.
National Review (3/24/21) column: "In the closing days of February, the Biden administration set its interim social cost of carbon, a metric that aims to capture the aggregate economic harm caused by an additional increment of carbon-dioxide emissions, at $51 per ton. The Biden administration’s $51 estimate will serve as a placeholder until, in its own words, the White House evaluates and incorporates the latest climate science and economic research. But while the White House has stressed that this exercise will restore policymaking norms, developments behind the scenes suggest that the administration will put its policy cart before the horse of climate economics...The flaw here is obvious: If we don’t have trustworthy estimates of climate damages, as Kaufman alleges in Nature, how do we know zeroing out carbon emissions is a cost-efficient endeavor? The Nordhaus approach, inconveniently for Biden and his new CEA hire, finds that the policies required to achieve a goal like Biden’s for 2050 would cause more harm than they would alleviate through emissions reductions...For right-of-center analysts and policymakers, the Pigovian aim of internalizing the costs of human activity is attractive. While the new school of climate thinking deploys some of the language of the Pigovian tradition, it ditches its foundation. Biden’s climate advisors, far from restoring norms, are crossing a methodological Rubicon. Unable to substantiate its preferred outcome, the Biden administration will scatter the deck and revise the rules to push our economy in a direction climate economics does not justify."
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"It's not even a slam dunk that EVs will combat climate change, given that they shift pollutants from the tailpipe to the power plant. 'Your battery-powered vehicle is only as green as your electricity supplier,' as Scientific American explained. Maybe we should leave it up to carmakers rather than pretend that California lawmakers have the wherewithal to save the planet?"
– Steven Greenhut, Reason
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