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Advanced biofuels, more-efficient vehicles, and solar power top the most notable energy stories of 2007.
A portable system converts biowaste into jet fuel and diesel for the military.
Politics continue to complicate energy policy.
One photovoltaic wire could power a sensor; arrays could yield cheaper electricity.
Gregory Stephanopoulos explains challenges in converting biomass to biofuels.
The global culture of valuable, fresh thinking.
Researchers are harnessing solar energy to convert carbon dioxide into carbon monoxide, which can be used to make fuels.