Paris is changing. There is a new attitude of green and sustainable ideals that are permeating the City of Lights everywhere you go. In many ways, Paris has had the qualities of a "green city? for a long time. Existing architecture has been adapted and reused for centuries. Paris has always been a walkable city, and its public gardens are well known. However, over the years, pollutants have made their impact?a gray haze from car exhaust hovering over the city. Today, offcials, businesses, and residents are making changes to help turn Paris green and prepare for a sustainable future. Bike lanes are replacing roadways. Food entrepreneurs are creating urban farms on the city's famous rooftops.