Inhabitat's Week in Green: human-powered helicopter, a 3D-printed SLR and smog-eating pavement

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. This week aviation fans witnessed a world's first as AeroVelo's human-powered helicopter won the elusive $250,000 Sikorsky Prize by hovering 10 feet off the ground for more than 60 seconds. The Solar Impulse sun-powered airplane also broke boundaries by completing the first sun-powered trip from coast to coast -- and Inhabitat was on the scene at New York'...