Renner, Michael. 2008 ‘Vehicle Production Rises, But Few Cars Are 'Green'.’ Vital Signs Online: Transportation and Communication. Washington, DC: Worldwatch Institute. 21 May

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The world's fleet of passenger vehicles is now an estimated 622 million, up from 500 million in 2000 and a mere 53 million in 1950.

Last accessed at:
http://www.worldwatch.org/node/5461

ID: Q1139

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