Speaking of endless troubles, "cap-and-trade" comes cloaked in reassuring rhetoric about the government merely creating a market, but government actually would create a scarcity so that government could sell what it had made scarce. The Wall Street Journal underestimates cap-and-trade's perniciousness when it says the scheme would create a new right ("allowances") to produce carbon dioxide and would put a price on the right. Actually, because freedom is the silence of the law, that right has always existed in the absence of prohibitions. With cap-and-trade, government would create a right for itself— an extraordinarily lucrative right to ration Americans' exercise of their traditional rights.

A carbon tax would be too clear and candid for political comfort. It would clearly be what cap-and-trade deviously is, a tax, but one with a known cost. Therefore, taxpayers would demand a commensurate reduction of other taxes. Cap-and-trade — government auctioning permits for businesses to continue to do business — is a huge tax hidden in a bureaucratic labyrinth of opaque permit transactions.

The proper price of permits for carbon emissions should reflect the future warming costs of current emissions. That is bound to be a guess based on computer models built on guesses. Lieberman guesses that the market value of all permits would be "about $7 trillion by 2050." Will that staggering sum pay for a $7 trillion reduction of other taxes? Not exactly.

It would go to a Climate Change Credit Corporation, which Lieberman calls "a private-public entity" that, operating outside the budget process, would invest "in many things." This would be industrial policy, a.k.a. socialism, on a grand scale — government picking winners and losers, all of whom will have powerful incentives to invest in lobbyists to influence government's thousands of new wealth-allocating decisions.

Lieberman's legislation also would create a Carbon Market Efficiency Board empowered to "provide allowances and alter demands" in response to "an impact that is much more onerous" than expected. And Lieberman says that if a foreign company selling a product in America "enjoys a price advantage over an American competitor" because the American firm has had to comply with the cap-and-trade regime, "we will impose a fee" on the foreign company "to equalize the price." Protectionism-masquerading-as-environmentalism will thicken the unsavory entanglement of commercial life and political life.