The green roof has grown increasingly popular in America in the last few years as sustainability has come to the forefront in design. Green roofs allow companies to put gardens on the roof of their urban buildings and improving the environment. Green roofs have been proven to improve air quality, keep cooling costs down, reduce stormwater runoff, and improve insulation of the building. Not to mention they look pretty. Green is hard to find in many urban areas, so this is a good solution as it does not take up valuable land and will also benefit the buildings on which they grow.