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Even though the London Olympics just ended, preparation for the 2016 Summer Games in Rio de Janeiro has begun. For most people, the Olympics stand for astonishing displays of athleticism, outstanding sportsmanship and national pride. Most people might not think past the events and the medal counts. But for host cities, the Olympics are a once-in-a-lifetime opportunity to reinvent themselves, to boost their local and regional economies and to set a forward-thinking example of sustainability for the rest of the globe.