Nebula Award Finalist: A "brilliantly crafted, engrossing" dystopian novel of environmental disaster by the Hugo Award-winning author of Stand on Zanzibar (The Guardian). In a near future, the air pollution is so bad that everyone wears gas masks. The infant mortality rate is soaring, and birth defects, new diseases, and physical ailments of all kinds abound. The water is undrinkable--unless you're poor and have no choice...