The 5 toughest challenges tomorrow's cities face

- Article by Mike Hower, Senior Writer, The GreenBiz Group.

From New York to Shanghai, cities across the globe are swelling, compounding social and environmental sustainability challenges.

Meanwhile, cities are on the frontlines of the climate change fight — although they generate 70 percent of global greenhouse gas emissions, city dwellers have smaller carbon footprints than national averages, according to the International Institute for Environment and Development.

In addition to climate change concerns, cities face challenges with communicating urgent but less visible sustainability problems to stakeholders, modernizing water and transportation infrastructure, improving urban design and feeding growing populations.

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