There was an interesting back and forth yesterday over at the Corner on McCain’s global warming policy. McCain backs a “cap-and-trade” system for carbon emissions rather than a direct tax, and Ramesh Ponnuru writes:
There is a debate between proponents of each approach, but for the most part people who want the federal government to discourage emissions see them as interchangeable, and so do people who oppose any such federal intervention.
Jonathan Adler responds:
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