CitySol returns for its final installment of the summer this Sunday. As usual, the free event will feature renewable energy powered live music, interactive exhibits, and a green lifestyle marketplace. CitySol will run from 2pm to 6pm at 23rd Street and the East River in Manhattan. For those who are unfamiliar with this summer series, Citysol celebrates the idea that greening New York is about unleashing, not taming, the city and its energy. Click here for more information.