In 2009 we saw a "first" on Earth. That's when the scales tipped, and more people lived in urban than rural areas. By 2050, 70 percent of humans will live in cities.While some associate cities with crowds, trash and traffic jams, others believe cities are an ecological option for the future. We'll talk about urban history, urban design and urban renewal this hour.

Guests:

Steven Conn, history professor and director of the public history program at Ohio State University

Michael Bongiorno, senior designer at DesignGroup, an architectural design firm in Columbus