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 took a peek into the future of our built environment by showcasing the most incredible designs from the 2010 eVolo Skyscraper Competition. From water purifying buildings to cities stacked on stilts and self-sufficient underwater skyscrapers, there's no shortage of futuristic thinking on tap.

Alternative energy was also a hot topic this week as China launched plans to tap "combustible ice" as an energy source and researchers at MIT discovered a new way to produce electricity by sending thermopower waves through carbon nanotubes.

We also saw several exciting advances in efficient transportation as South Korea rolled out an EV that is recharged by electrified roads and researchers at UT Dallas revealed a heat-scavenging tailpipe that may one day help power cars. And if you think your Prius gets good mileage, get a load of this super-efficient gas engine that gets 98 MPG. Finally, if you rely on that morning cup of coffee to get your engine running, you won't want to miss this coffee-powered car that gets 56 espressos per mile

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Inhabitat's Week in Green: skyscrapers, combustible ice, and coffee-powered cars