Over the last half billion years, there have been five major mass extinctions, when the diversity of life on Earth suddenly and dramatically contracted. Scientists are currently monitoring the sixth extinction, predicted to be the most devastating since the asteroid impact that wiped out the dinosaurs. This time around the cataclysm is us. In this book the author tells us why and how human beings have altered life on the planet in a way no species has before. She provides a moving account of the disappearances of various species occurring all around us and traces the evolution of extinction as concept, from its first articulation by Georges Cuvier in revolutionary Paris up to Lyell and Darwin, and through the present day. The sixth extinction is likely to be mankind's most lasting legacy, compelling us to rethink the fundamental question of what it means to be human. -- Publisher description.

In Union Grove, early spring is a challenging season, known as the "six weeks want," a time when fresh food is scarce and the winter stores are dwindling. The town is struggling in particular this year as the Hudson River trade route to Albany has been halted by the local plantation tycoon Stephen Bullock, who has deemed it too resource-intensive and is now striving for self-sufficiency. Meanwhile, after returning from his travels around what is left of the United States, Daniel Earle is intent on resurrecting a newspaper for the community, and finds an interesting story to cover when representatives of a group of anti-establishment, hyper-liberals known as the Berkshire People's Republic arrive in the town.