General Motors is rolling out an "Ecologic" eco-label for its Chevrolet brand, enabling shoppers to gauge a vehicle's environmental impact while they stroll around a dealer's lot. That's a good start, writes Eric Evarts, but more detailed labels are needed to elevate the move above a marketing ploy. "To be more meaningful, the label would have to be tied to industry standards that could, for example, rate the car's and the factory's environmental qualifications against its peers," Evarts writes.

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