Each week our friends at Inhabitat recap the week's most interesting green developments and clean tech news for us -- it's the Week in Green.
Researchers at the University of Michigan are making waves in solar panels -- literally. It turns out that their undulating photovoltaic strips can collect up to 30 percent more energy than flat arrays. In other energy news, China and Pakistan just announced plans to build the world's largest solar farm in the Punjabi desert, and Aspen, Colorado, just became the third city in the US to be powered entirely by renewable energy. Heads up students -- we're giving away three solar energy-generating Voltaic backpacks and you can win one here. Voltaic also just launched a new solar-powered light that shines for 30-plus hours on a single charge. And designer Pauline van Dongen debuted a solar parka that keeps you charged when you journey off the grid.