"Politicians and commentators are understandably pessimistic about the chances of an international deal on carbon cuts emerging from the United Nations summit in Mexico this December. ... Despite all of the optimistic talk about wind, solar, geothermal, and other sustainable, non-carbon-emitting energy sources, no alternative is remotely ready to shoulder the energy burden currently borne by fossil fuels. This is why I have long urged policymakers to increase significantly the amount of money invested in research and development of green-energy alternatives. Now there is research that shows exactly how we can put this approach into action."