Page last updated at 12:51 GMT, Monday, 2 November 2009

Future fuel: From algae to oil

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With the Copenhagen summit on climate change fast approaching, the race is on to find new technologies which will help produce cleaner, greener fuel.

One approach scientists are looking into is harvesting algae to transform into an oil substitute.

BBC Environment Correspondent David Shukman visited an algae-swamped pond in southern California to find out more.

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