Summary: <p><span style="color: black; font-family: Arial;"><span>For centuries, cities have been bringing people together. Now, for the first time in history, more than half the world's population lives in cities. What draws people to them? What changes when we live closer together? How can cities offer humanity its best hope for a sustainable future? TED speakers Stewart Brand, Robert Neuwirth, Ellen Dunham-Jones, and Geoffrey West investigate the future of our urban zones. </span></span><span style="font-size: medium; color: #000000;" size="4" color="#000000"><span style="font-size: 13.5pt; color: black;"><br></span></span></p>
