by Gregory Benford (Published by Simon & Schuster)

Winner, in

The author of Tides of Light offers his Nebula Award-winning SF classic–a combination of hard science, bold speculation, and human drama. In the year 1998, a group of scientists works desperately to communicate with the scientists of 1962, warning of an ecological disaster that will destroy the oceans in the future–if it is not averted in the past.