The city of Rochester just completed work on its first ever "green roof."
The roof of City Hall's Building B is now home to 8,700 square feet of succulent plants.
"It's basically for storm water management," says Anne Spaulding, the city's sustainability manager, during a rooftop tour. "All of the rainwater - instead of running into the storm system - is consumed by the plants on the roof."
Spaulding says the thick carpet of sedum can reduce storm water runoff by up to 90 percent, depending on the amount of rainfall.
The goal is to reduce the amount of pollutants that flow into the region's streams, rivers and lakes.