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Report: Most biofuels aren't green

Ice-like solar roof tiles keep homes toasty warm

Peugeot Onyx is a sexy hybrid supercar

Porsche 918 Spyder plug-in hybrid hits the track


Future airports to launch planes with a "slingshot"

Citroen conceptualizes the DS3 as an electric

BMW C Evolution electric scooter hits Paris runway



BMW i3 concept spotlights sustainability 


Smart Forstars EV concept one really big movie projector