Inhabitat's Week in Green: ice castles, cardboard columns, and the Geneva Auto Show

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 Inhabitat showcased several jaw-dropping feats of architecture, starting with a series of amazingly complex computer-designed cardboard columns that boast between 8 and 16 million facets. We were also struck by a stunning new net-zero Solar Academy in Germany, and we showcased a Swiss chalet that is the world's first apartment building to be heated entirely by solar thermal energy. On the cooler end of the climate spectrum, a Minnesota man has created a series of soaring ice castles using water from his geothermal heating system.

The Geneva Auto Show also kicked off with a bang this week as Koenigsegg unveiled its supercharged Agera R racer and SAAB rose from the ashes with a futuristic PhoeniX hybrid. We also heard big news from some of the world's most luxurious automakers as Bentley rolled out a biofuel-powered supercar that can go 200 MPH on ice and Rolls-Royce unveiled their all-electric 102 EX Phantom. Two-wheeled transportation also took a leap forward as Daymak unveiled the world's first wireless electric eBike and Los Angeles approved plans for 1,690 miles of bikeways.

We also kept on the cutting edge of consumer tech with a look at the green credentials of Apple's iPad 2, and we brought you researchers' plans for a hot new breed of batteries made from "frozen smoke". Finally, we learned from a recent study that cellphone signals actually boost brain activity, and we shared a fresh new line of iPod nano watch straps just in time for spring.