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Can our cities cope in the face of rapid urbanisation? We hear from the megacity of Dhaka in Bangladesh, where migrants are struggling with poor water, health and schooling services. We also go to Beijing, where marathon runners last year were force to pull out, or run in masks, because air pollution was at dangerous levels. Ed Butler talks to Leo Johnson, co-author of Turnaround Challenge: Business and the City of the Future and Sir David King, Chairman of the Future Cities Catapult and currently the British Foreign Secretary's Special Representative for Climate Change. Plus, the independent economist Andy Xie joins the debate from Hong Kong.