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The California Air Resources Board has given a green rating to the 2011 Chevrolet Volt, the grade atop the page being ULEV (Ultra Low Emissions Vehicle). That's below the SULEV and PZEV ratings of cars you might not expect to beat the Volt, such as the four-cylinder Honda Accord and Volkswagen Golf GTI 2.0T and Jetta TDI. Also on the list as being cleaner than the Volt are the Toyota Prius, Honda Insight and Honda CR-Z. Click past the break for some interesting comparative charts.

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Guide to Common Green Acronymns

Deciphering the new vocabulary of the green car movement can sometimes be a real head scratcher. To alleviate as much confusion as possible, we would like to present our readers with a list of common acronyms and what they mean, with plenty of links for more information. If you have some TLAs (that's three-letter acronyms) that you'd like us to add to our glossary, just let us know in the comments.

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Click image for gallery of the Nissan X-Trail

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A month ago, Joel noted that Moller, the makers of the Skycar, found ethanol to be the perfect fuel for its Rotapower rotary engines. Today, Moller announced in a new press release that with ethanol, they're achieving remarkably low emissions.

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If you're like me, then all of the EVs (SULEV, ULEV, PZEV) attached to new car emissions descriptions are sort of baffling. The EVs are vehicle emissions standards in the state of California, but have gained popularity because they're easy to use and help salespeople sell cars to gals like me who wear their Birkenstocks to the dealership. Here's the scoop on what the different standards refer to:

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