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In Germany’s Ruhr Valley, once the industrial heartland of the coal and steel industry, a remarkable transition into a modern, hi-tech economy is taking place. Based in Dortmund , the historian and author Katja Hoyer, reports on a city which benefits from a new, green landscape, excellent universities and a growing , youthful population - to say nothing of a world class football team. But for those left out of this brave new world the picture is not so bright.