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Published online 16 November 2006 | Nature | doi:10.1038/news061113-15
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More than a billion cars to hit the road
Gas guzzlers highlight need for new technologies.
An economic assessment predicts that the number of private cars on the world's roads will skyrocket from today's figure of just over 600 million to between 1.4 and 2.7 billion by 2050, doubling or quadrupling their carbon dioxide emissions.
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