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Last Updated: Monday November 16 2009 13:58 GMT

In pictures: A ghost forest in London

Tree stumps in Trafalgar Square

These giant tree stumps have been placed in London's Trafalgar Square as part of a new art exhibition, called Ghost Forest.

Tree stumps in Trafalgar Square

They're designed to make people think about climate change. Laser beams will mark the height they would have reached had they not been cut down.

Artist

Artist Angela Palmer got the trees from Ghana in Africa, which has lost 90% of its rain forest in the past 50 years. These stumps are from trees which fell naturally.