The forests shrink, the aquifers fall, the soils erode, the oceans empty, the rivers dry, the species die, the climate destabilises, and the slums expand. These are not warnings of the future; they are descriptions of the present. The Earth has already answered the question of overpopulation.

Farmed pigs weigh as much as all of the world’s whales, orcas, sea otters, seals, and dolphins combined. All the dogs in the world, including pets and feral dogs, weigh as much as all wild mammals on land.