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This week at TreeHugger: General Motors is opening up China to hybrids and hydrogen; surely a welcome addition to their daily road situation. Out of Argentina comes the Nexo, a modular, adaptable, natural-gas vehicle for the modern city. This year's European GreenFleet award puts Citroen at the top of the list, not for their hybrids, but for their diesels. Toyota's Prius lineage could be growing to include smaller city cars and larger utility brethren. Biodiesel earns its commodity status, car washing in Toronto goes solar, and Yahoo! offers green guidance on car buying.

[TreeHugger's Perspective Shift roundup appears every Wednesday]