Because there’s no denying that pretty much every problem in the biosphere hails from a common cause. Climate change, pollution, habitat loss, the emptying of biodiversity from land sea and air, an extinction rate unparalleled since the last asteroid and the transformation of our homeworld into a planet of weeds—all our fault, of course. There are simply too many of us. Over seven billion already, and we still can’t keep it in our pants.
