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Deserts are eroded by rainwater run-off and the wind. Desert soil is far from useless; it is rich in nitrogen and mineral compounds.
Meet the Catlin Arctic Survey team members
A team of polar explorers has travelled to the Arctic in a bid to discover how quickly the sea ice is melting and how long it could be before the Arctic summer becomes ice-free.
The freezing winters of Northern Canada
Kate Humble visits ice road truckers in Canada to see how lakes get icy enough to drive on well after mid Winter.