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This week at TreeHugger: Clean diesel fuel hits the pumps this week, which means clean diesel vehicles will be hitting the market soon. In Ontario, the couriers are getting an edge on things by going green. Popular Mechanics names its Breakthrough Award winners, including the Tesla EV, new hydrogen technology, and DaimlerChrysler's BlueTec diesel engine. And the French-designed Audi R-Zero electric super car brags performance and style to make even the Tesla nervous.

[TreeHugger's Perspective Shift roundup appears every Wednesday]