Everyone wants to be "The Greenest City in America," Philadelphia included.

So: How we doin'?

In the final hour of its innovation week, Radio Times checked in on a handful of sustainability efforts bubbling up across the region.

We’ll learn about cutting-edge passive housing, a revolution in construction waste recycling, innovation in locally-grown food distribution and Mayor Nutter’s Greenworks plan. Our guests are KATHERINE GAJEWSKI, Director of Philadelphia's Office of SustainabilityTIM MCDONALD, an architect and President of Onion FlatsJON WYBAR, co-founder and manager of Revolution Recovery; and HAILE  JOHNSTON, founder of Common Market, a distributor of locally-grown foods.

As one guest put it, Philadelphia "has great bones." The job now is for green innovators to flesh out that hearty, urban skeleton with the technologies, projects and policies that will allow Philly to thrive in a resource-strapped world.

You can stream the podcast below or download it and listen later.