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: The Messenger; Immediate steps to sharply reduce emissions could still prevent the worst consequences of global warming, says famed NASA climatologist Jim Hansen.

: It's Not Too Early; There is no escaping the reality that in the end, we will need an energy economy based on solar, wind and other renewables.

: The Oil Frontier; Discoverer Deep Seas captures the new oil.

: The Dirty Secret; Better technologies exist for extracting coal, a major source of carbon dioxide emissions. The challenge is getting people to adopt them.

: The Best Nuclear Option; The U.S. Energy Department's fuel-recycling initiative could be a distraction from a more achievable goal: reviving today's nuclear industry and averting some carbon emissions in the short term.

: Brazil's Bounty: A Photo Essay; A sun-drenched look at how this agricultural giant has become a global leader in biofuels.

: Beyond the Solar Panel; The U.S. government plans to produce a buyer's guide to power-converting roofing materials.

: Cheaper, Cleaner Combustion; A simple new design for combustion chambers used in power plants could slash the amount of pollutants and the costs to consumers.

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Worries over the future of gasoline supplies and the effects of carbon dioxide emissions on global warming are driving innovators to rethink how we get around. On the horizon: better batteries, cleaner fuels, and redesigned engines.

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Massachusetts Institute of Technology