Another fine design example from Adrian Smith and Gordon Gill (see their “energy-positive” design here). This circle in the lake serves two purposes: to create an area of calm water, known as breakwater, that can be enjoyed by tourists and enthusiasts, adding aesthetic value to the city. Additionally, the ring supports wind turbines that generate power for the city using the particular weather there to the city’s advantage. All the while providing a place to stroll out for a great lake-front view. This is a nice application of a city coming together to think on an integrated level about space usage. With proper focus, making a change in even one area of the green spectrum can be amazingly far-reaching.