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Page last updated at 07:14 GMT, Monday, 16 March 2009

Turning sewage into charcoal

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German engineers have invented a machine that turns sewage into charcoal, which they say helps the fight against climate change.

They also claim feeding the charcoal to plants helps them grow faster.

Roger Harrabin reports.

SEE ALSO

Engineer on turning sewage into charcoal(01.35)
How to make your plants grow faster (01.36)

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