Inhabitat's Week in Green: inflatable concert hall, Xkuty One electric bike and an E. coli filter

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. Most of the world still runs on fossil fuels, but renewable energy is making big gains. Not only are renewables better for the environment, but they're also becoming just as cost-effective as their dirtier counterparts. A new study finds that wind farms are less expensive than new coal-fired plants, and they cost about the same as new natural gas plants. S...