This global die-off is called the Quaternary extinction event. And they proved,” he pointed to the book, “definitively, that our ancestors caused it. A global holocaust, not just of other humans, but of every large mammal on Earth, with only a few exceptions. Even today, we humans account for 350 million tons of biomass on this planet. That’s three times the biomass of all the sheep, chickens, whales, and elephants—combined. This planet has become an ecology almost completely dedicated to fueling our massive calorie-hogging brains.”
