Page last updated at 06:23 GMT, Monday, 16 March 2009

How to make your plants grow faster

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German engineers have come up with a remarkable machine that turns sewage into charcoal.

If that was not enough of a feat, they say it helps the fight against climate change by locking up carbon from the sewage that would have gone into the air.

Dr Bruno Glaser from Bayreuth University in Germany is doing experiments with biochar and explains how it could be used to make plants grow faster.

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