The charged and complex debate over how to slow down global warming has become a lot more complicated.
Most of the focus in the past few years has centered on imposing caps on greenhouse gas emissions to prod energy users to conserve or switch to nonpolluting technologies.
Leaders of the Intergovernment Panel on Climate Change - the scientists awarded the Nobel Peace Prize last year with former Vice President Al Gore - have emphasized that market-based approach. All three presidential candidates are behind it. And it has framed international talks over a new climate treaty and debate within the United States over climate legislation.
But now, with recent data showing an unexpected rise in global emissions and a decline in energy efficiency, a growing chorus of economists, scientists and students of energy policy are saying that whatever benefits the cap approach yields, it will be too little and come too late.
The economist Jeffrey Sachs, head of the Earth Institute at Columbia University, stated the case bluntly in a recent article in Scientific American: "Even with a cutback in wasteful energy spending, our current technologies cannot support both a decline in carbon dioxide emissions and an expanding global economy.
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