The Chinese government is planning to close 1,000 coal mines over the course of this year - that means 1.3 million jobs will be lost as China seeks to reduce its coal dependence and curb its air pollution. However, economies in cities like Datong almost completely rely on coal. Our correspondent goes to China's industrial north to see how the government plans to deal with this dilemma. A programme prepared by Phoebe Lanzer-Wood and Elise Duffau.