Dense cities are a lot more energy efficient than decentrilized sprawl, explains Harvard professor and urban advocate Edward Glaeser in this interview recorded by On The Earth Productions at this year’s Congress for New Urbanism in Madison, Wisconsin.

Continuing his previous commentary on the intersection of urban centers and social justice, Glaeser argues for cities as a unique and essential social phenomenon to share and exchange resources and ideas on both a political and personal level.

—Anna Lekas Miller