The U.S. has plenty of the metals that are critical to many green-energy technologies, but engineering and R&D expertise have moved overseas.
A new Mazda model debuting in Japan gets its high fuel economy from an improved gas engine and a lightweight design.
The cells might eventually replace the turbines in high-efficiency power plants.
Four cities pledge to better manage overall energy use and cut greenhouse emissions.
The rest of the world is trying to find alternatives to these crucial materials.
Chinese photovoltaic giant Suntech looks to electronics to help squeeze more power out of solar arrays.
A new polymer film protects panels from water so they can last for decades.
The government funds a factory to make battery materials, but it's not even clear they'll be needed.
Active metamaterials might be used in solar cells that change properties with the weather.
Attackers could manipulate poorly protected data to make money or cause blackouts.