Cap-N-Trade

Samuleson:

The chief political virtue of cap-and-trade -- a complex scheme to reduce greenhouse gases -- is its complexity. This allows its environmental supporters to shape public perceptions in essentially deceptive ways. Cap-and-trade would act as a tax, but it's not described as a tax. It would regulate economic activity, but it's promoted as a "free market" mechanism. Finally, it would trigger a tidal wave of influence-peddling, as lobbyists scrambled to exploit the system for different industries and localities. This would undermine whatever abstract advantages the system has.

Bingo. We need a direct carbon tax. It achieves the same result with less complexity.