Timescape

Winner of the 1980 Nebula Award, Timescape  has since become a classic of the science fiction genre, combining hard science, bold speculation, and human drama—a challenging and triumphant tale told by a master storyteller.  1998. Earth is falling apart, on the brink of ecological disaster. But in England a tachyon scientist is attempting to contact the past, to somehow warn them of the misery and death their actions and experiments have visited upon a ravaged planet.  1962. JFK is