Urban Designer Peter Calthorpe on Making Greener Cities

For more on this story, visit The PBS NewsHour at to.pbs.org/PXuY4q
Urban designer Peter Calthorpe says there is one simple thing cities can do to cool down every summer: plant trees. NewsHour's Hari Sreenivasan spoke with Calthorpe at the Aspen Environment Forum this summer about how cities need to have more vegetation and fewer cars in order to adapt to a changing climate.