Sky-Terra Towers

Recreation space is rare in the world’s most-congested cities and in the parks that do exist, tall buildings often block the sun and auto exhaust pollutes the air. San Francisco designer Joanna Borek-Clement’s solution is to build green areas atop interconnected skyscapers 1,600 feet above the ground. Elevators in each scraper’s inner core would transport people to the top, a sanctuary of green filled with sports fields, amphitheaters, pools and public parks. Sustainability efforts, like rainwater collection and modular construction, would cut both pollution and energy costs.