The world's cities are growing by 1.4 million people every week. This remarkable demographic shift is creating densely populated communities that can be centers of innovation and economic opportunity. These cities can also be healthier for people, with cleaner air, and more resilient to climate change, but only if urban leaders with real influence have the vision to meet the challenges of the 21st century.
New York, which will host the UN Climate Summit on September 23, has been a leading example of a city with a sustainable development strategy, PlaNYC -- initiated by former Mayor Michael Bloomberg -- and a dedicated office to make the city more resilient to extreme weather and other climate impacts....
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