green roof

Toronto, Ontario is the first municipality in North America to take on a comprehensive green roof plan. After discovering that blanketing just 8 per cent of our rooftops with greenery would save the city a cool $300M in energy costs and storm water overflows as well as a 2 degree drop in the steamy urban "heat island" effect. City council signed onto the plan and now subsidizes private roof greening.
You can learn more about the program here.