Page last updated at 12:04 GMT, Wednesday, 9 December 2009

Green technology to harness power of waves

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At the Copenhagen Summit, national leaders are gathering to discuss climate change.

One possible solution being put forward for lowering carbon emissions is an increased investment in green technology.

Environment correspondent David Shukman visits the Orkney Isles to see how machines that look like a giant Polo mint, a sea snake and an oyster could help to harness the power of the waves.

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