Last week at the Doha climate conference, 200 nations agreed to extend the Kyoto Protocol to 2020 and back in the US, a report showed that Americans installed a record-breaking 3.2 gigawatts of rooftop photovoltaic panels in 2012.
ENGADGET: Inhabitat's Week in Green: madder root batteries, sun-powered plane and the world's first fiber-optic solar cell