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This week at TreeHugger: As the Detroit Auto Show approaches, Volvo and Ford are oiling up their biofuel muscle to strut, while Toyota is getting ready to flash some fast hybrid. Pheonix Motorcars has an electric vehicle in the works that could change the game: a five-seater flatbed sport utility that is looking at 250 miles per charge. The EU rules that automakers must take back any car, no matter how old or busted, for recycling. Ethanol production in the US rockets upwards, but is still just 2% of petrol use. Also, TreeHugger glances back at car posts of 2006 and the diesels, hybrids, and electrics that garnered the most attention.

[TreeHugger's Perspective Shift roundup appears every Wednesday]