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Available for over a year

Part two of science documentary exploring the "skin of the Earth". What happens when soil gets poisoned or compacted, or the surface is stripped of its trees, bushes, grass and the soil erodes? How can humans prevent the cycle of life from snapping? "I think we're coming to the realisation that the wealth of nations has always been the wealth of nature to an important extent." Donald Worster Professor of American History at the University of Kansas.