The Seeds of Time (Bantam Spectra Book--T.P. Verso)

Clio Finn is a Dive pilot, one of the few humans able to guide a spacecraft back through time. In a 2019 that has seen Earth lose most of its plant life, Dives are the last hope humanity has for finding new seeds to replenish the planet. But Clio is strung out on drugs, one step away from a court-martial, and carrying a terrible secret about her past. When events force her to make a desperate attempt to save the planet, Clio has little to lose. It is then that she learns humanity's troubles are far worse than they seem ...