From the author of the international bestseller Sapiens: A Brief History of Humankind comes an extraordinary folllow-up that explores the future of the human species. Now available as a trade paperback.      Humans today enjoy unprecedented levels of power and an increasingly god-like status. The great epidemics of the past - famine, plague and war - no longer control our lives. We are the only species in history that has single-handedly changed the entire planet, and we can