The Anthropocene

The second chapter zooms out to the species' impact on the planet. Geologists have started using the term Anthropocene to describe a new geological epoch defined by human action — a period in which a single species, ours, has become the most significant force shaping Earth's biosphere. Harari treats this not as environmental commentary but as a basic fact about scale: in the last 70,000 years Sapiens has done what no other animal has done, which is to spread to every continent (including Antarctica via research stations) and become the dominant predator-engineer-architect of every ecosystem we touched.

The chapter's central evidence is biomass. The total biomass of large wild animals has collapsed; the biomass of humans + livestock now massively dominates. Domesticated chickens, pigs, and cattle exist in numbers — and through industrial farming, with experiences — that no biologist or ethicist would have predicted three centuries ago. The American Society for the Prevention of Cruelty to Animals was founded in 1866; the factory-farm chicken industry that processes ~70 billion birds per year exists in spite of that movement, not because the movement failed but because the scale outran the moral frame.

Harari uses this to make a philosophical point that anchors the rest of the book. Animism — the worldview of pre-agricultural humans — treated other species as equal participants in a shared world; theistic religions repositioned humans as the privileged species created in God's image but still bound by divine law; modern humanism positioned humans as the source of meaning, with other species relegated to instrumental status. Each move expanded human freedom and shrank the moral circle around other living creatures. The Anthropocene is the practical result of that philosophical chain.

The chapter does not moralize but does push the reader to notice the asymmetry. We tend to apply the standards of recent humanism — animal welfare, environmental stewardship — backwards onto historical Sapiens behavior. Harari's question is whether we will apply those standards forward to future Sapiens behavior, especially as biotech enables humans to engineer new species and as artificial intelligence raises the question of whether non-biological intelligences deserve moral standing. The Anthropocene's defining feature, in his telling, is that Sapiens has become responsible for outcomes at planetary scale without yet developing the philosophical or political institutions to wield that responsibility well. The chapter closes on the implicit warning: the next epoch may not be the Anthropocene but something post-human, and the choices that lead there are being made now, by people not particularly aware they are making them.