In the 22nd century Earth's citizens sought protection from growing toxicity: from blinding UV "pink outs" destabilized weather, biological contaminants, and fatal viruses and bacteria. The Arcology, inspired by the first undersea cities, changed this - by offering protection from such threats to civilization. With mile-tall towers rising from the ashes of the failing metropolises, the Arcology provided people with safety, sunlight, and filtered air, taunting those trapped below with the sight of redemption.