Highlights from The Atlantic's annual summit on urban innovation.

The Atlantic, the Aspen Institute, and Bloomberg Philanthropies on Monday and Tuesday hosted the third annual CityLab: Urban Solutions to Global Challenges in London. The event brought together 400 global city leaders—more than 40 mayors, plus urban theorists, city planners, scholars, architects, and artists—for a series of conversations about the big ideas that are shaping the world's cities and metro centers. CityLab.com readers can watch portions of the event below, and join the conversation on social media using #CityLab2015 and following @Atlantic_LIVE, @AspenInstitute, and @BloombergDotOrg.

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