Utrecht, a city in Holland, has given a remodel to its 316 bus stops,  providing  them with "green roofs,"  The roofs are covered with sedum flowers and other plants, which act as a hub for bees. The beautiful greenery and flowers  added have a host of  other positive environmental effects. 

The plants will  absorb rain, capture dust or  toxins from the air, and regulate temperatures. Also,  adding plants in urban spaces has plenty of other benefits, including: reducing noise pollution, reducing stress,  absorbing carbon, making the city more beautiful and improving air quality.