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.
News that Amazon will add three large biospheres to its downtown Seattle headquarters had the tech world buzzing this week. The domed structures will feature a mix of workspaces and gardens, and they'll be flanked by a public park. Amazon's big announcement wasn't the week's only surprise, though. A multinational consortium announced plans to develop a Dubai-style artificial island with a space hotel and a zero-gravity spa off the coast of Barcelona. And new research finds that "pinkhouses" -- vertical farms that use only pink light -- are much more efficient than those that use the full light spectrum.