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Latest Saturday rundownWE Saturday Feature
May 18, 2013 | NPR ·
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WE Sunday Feature
May 19, 2013 | NPR ·
Daniel Sperling
Jan 15, 2009 — Transportation expert Daniel Sperling estimates that the world's car population — which currently stands at 1 billion vehicles — is likely to double in the next 20 years. Sperling is the co-author (with Deborah Gordon) of Two Billion Cars: Driving Toward Sustainability.


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