So what to do? We need a more “radical center” — one much more willing to suggest radically new ideas to raise revenues, not the “split-the-difference-between-the-same-old-options center.” And the best place to start is with a carbon tax.

A phased-in carbon tax of $20 to $25 a ton could raise around $1 trillion over 10 years, as we each pay a few more dimes and quarters for every gallon of gasoline or hour of electricity. With that new revenue stream, we’d have so many more options. One, preferred by Republicans like the statesman George Shultz and the Nobel laureate Gary Becker, is to make the carbon tax “revenue neutral.” It could be offset entirely by a rebate or by cutting tax rates for every U.S. citizen and corporation, which would increase spending. Another option, the one I’d prefer, would devote half the carbon-tax revenues to individual and corporate tax cuts, use a quarter for new investments in infrastructure, preschool education, community colleges and research — which would create jobs now and tomorrow — and then use a quarter on deficit reduction.

In short, if you added such a carbon tax to Obama’s budget, you’d have the makings of a radical grand bargain: Republicans would have the income tax cuts they want; Democrats would get the additional infrastructure stimulus they want, plus a new revenue stream to start gradually addressing the deficit, while reducing the amount that we’d have to bite from entitlements now; and the country would have a vehicle to address climate change, to drive clean-tech innovation (and to take money away from people who fund jihadist hate sites on the Internet).