Page last updated at 15:54 GMT, Friday, 18 September 2009 16:54 UK

Aboard the world's biggest cargo ship

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Global shipping contributes about a billion tonnes of CO2, more than the entire economies of Germany or the UK.

The International Maritime Organization says moving goods by ship is 80-100 times more efficient than by air.

But the Scandinavians are taking ships' emissions seriously.

Roger Harrabin was given a tour of the Estelle Maersk, the world's biggest container ship, which its owners claim is the most efficient in the world.

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