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City Century

Why Municipalities Are the Key to Fighting Climate Change

Fog over the New York skyline, May 2013. LUCAS JACKSON / REUTERS

Although history is not usually taught this way, one could argue that cities have played a more important role in shaping the world than empires. From Athens and Rome to Paris and Venice to Baghdad and Beijing, urban ideas and innovators have left indelible marks on human life. By concentrating the brainpower of humanity in relatively small geographic areas, cities have promoted the kinds of interactions that nurture creativity and technological advances. They have been the drivers of progress throughout history, and now—as the knowledge economy takes full flight—they are poised to play a leading role in addressing the challenges of the twenty-first century.

One hundred years ago, some two out of every ten people on the planet lived in urban areas. By 1990, some four in ten did. Today, more than half of the world’s population dwells in urban areas, and by the time a child now

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