a Polar Umbrella

During the last decades of global warming, the polar ice caps have experienced a severe rise in temperature causing the northern and southern ice shelves to become thin, fractured, and melt into the ocean. Rebuilding the arctic layers is the primary objective of this proposal which cools down the Earth’s surface by reducing heat gain in vulnerable arctic regions.
http://www.evolo.us/featured/polar-umbrella-buoyant-skyscraper-protects-and-regenerates-the-polar-ice-caps/