And also some views of the roof: Here are some photos from Wednesday's unveiling of the green roof bus shelter at 15th and Market.

Green Roof Bus Shelter (left), William Penn (right)

Mayor Michael Nutter introduces Philly's first green bus shelter

Philadelphia Water Department commissioner Howard Neukrug

City of Philadelphia's Director of Sustainability Katherine Gajewski

Roofmeadow President and Founder Charlie Miller explains the design and installation of the green roof