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According to the United Nations, by the year of 2050, 70% of the world’s population will be living in urban areas. So what will the city of the future look like? These are some of the questions that dominate our conception of “The City 2.0”: How will we transport ourselves? Where will we grow our food? How will we power our homes, our offices, our grids? What will happen to the natural world?

Today — October 13, 2012 — communities across the globe will be offering answers to these questions as part of TEDxCity2.0 Day, when nearly 70 TEDx events will be held in conjunction to dream about the city of the future. Events will be taking place from Antananarivo, Madagascar, to Daejeon, South Korea. In fact, so many events are happening today that the TEDx program is celebrating an exciting milestone — the 5,000th event since its launch in 2009.

To celebrate the City 2.0 and the spirit of urban inspiration, here are 6 great TEDxTalks about the future of cities.