Inhabitat's Week in Green: solar houses, geothermal power, and the world's slowest Porsche

The Week in Green is a new item from our friends at Inhabitat, recapping the week's most interesting green developments and clean tech news for us.

This week Inhabitat showcased some of the world's most stunning sun-powered homes as the European Solar Decathlon kicked off Friday in Madrid, Spain. We can't wait to see the winner of this year's competition, which challenged 17 teams from around the world to build the most efficient solar-powered house. Will it be the University of Nottingham's hyper-efficient H.O.U.S.E, Florida's Re:Focus prefab, or one of the other amazing contenders?

Speaking of solar power, the field of clean tech had a hot week as Sanyo unveiled the world's most efficient solar module. We also saw solar power energize Africa's largest slum as a photovoltaic television set allowed residents of Kibera, Nairobe to watch the World Cup. Several massive new geothermal projects rounded out our renewable energy news this week as the US Department of Energy unveiled plans to make Nevada the "Saudi Arabia of Geothermal Energy".

In other news, two-wheeled transportation took the world by storm as Italy unveiled its first electric motorcycle and Switzerland showcased its Zerotracer Superbike, which is set to circle the globe in 80 days using only renewable energy. And if a peddle-powered ride is more your pace, then you won't want to miss the world's slowest Porsche.

If all that exciting transportation news has you overheating, then relax and cool off -- here's a futuristic refrigerator that keeps things cool with bio gel and an underarm clothing patch that eliminates body odor through nanotechnology. And finally, if you're ready to relax and slip into some summer reading, we're giving away an iPad complete with a bamboo DODOcase -- hit the link to enter!