Rooftop gardens are not only great for the environment, but also are a great investment for the university. When correctly installed, a rooftop garden can actually prolong the life of a building's roof for up to 20 additional years. In addition, it acts as an insulator from the weather, and can save you up to $200,000 in air conditioning costs over the lifetime of a building! In addition, it creates a pleasant, usable space in what otherwise would be an empty, ugly roof. Compared to something like solar panels, a garden is cheap to install and requires minimal maintenance to create this beautiful and functional space.