"Manufacturers have resorted to all sorts of tricks to transform the show into a green week," the environmental group's auto specialist Wolfgang Lohbeck claimed as he stood before the sprawling Frankfurt fair grounds.

Around 20 Greenpeace activists transformed the three German cars, an Audi, a BMW and a Volkswagen, to attract attention to what they called "climate hogs."

The world's biggest auto show was placed under the theme of sustainable mobility, and scores of automakers presented new models designed to cut fuel consumption and greenhouse emissions.

But Lohbeck charged that proposals to reduce the amount of carbon dioxide produced by motor vehicles were "old plans that were lying around engineers' drawers and hauled out at the last minute."

Greenpeace argues that the weight of motor vehicles and the size of their engines must be reduced substantially to decrease the amount of CO2 they produce.

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