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GM's 135 patents represented nearly 14 percent of the 1,881 US patents obtained by 700 organizations in 2010, according to an analysis by the Clean Energy Patent Growth Index.

In an attempt to mimic the photosynthetic systems found in plants and some bacteria, scientists have taken a step toward developing an artificial light-harvesting system (LHS) that meets one of the crucial requirements for such systems: an approximately 100% energy transfer efficiency. Although high energy transfer efficiency is just one component of the development of a useful artificial LHS, the achievement could lead to clean solar-fuel technology that turns sunlight into chemical fuel.

US President Barack Obama said Saturday that a transition to cleaner energy will help create more American jobs as he promoted his new initiative designed to reduce US energy imports by a third.

Those solar panels on top of your roof aren't just providing clean power; they are cooling your house, or your workplace, too, according to a team of researchers led by Jan Kleissl, a professor of environmental engineering at the UC San Diego Jacobs School of Engineering.