In pictures: A ghost forest in London

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

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 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.

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