The human economy is currently too big to be sustainable. We know this because Global Footprint Network, which methodically tracks the relevant data, informs us that humanity is now using 1.5 Earths’ worth of resources.

We can temporarily use resources faster than Earth regenerates them only by borrowing from the future productivity of the planet, leaving less for our descendants. But we cannot do this for long. One way or another, the economy (and here we are talking mostly about the economies of industrial nations) must shrink until it subsists on what Earth can provide long-term.

Saying “one way or another” implies that this process can occur either advertently or inadvertently: that is, if we do not shrink the economy deliberately, it will contract of its own accord after reaching non-negotiable limits. As I explained in my book The End of Growth,there are reasons to think that such limits are already starting to bite. Indeed, most industrial economies are either slowing or finding it difficult to grow at rates customary during the second half of the last century. Modern economies have been constructed to require growth, so that shrinkage causes defaults and layoffs; mere lack of growth is perceived as a serious problem requiring immediate application of economic stimulus. If nothing is done deliberately to reverse growth or pre-adapt to inevitable economic stagnation and contraction, the likely result will be an episodic, protracted, and chaotic process of collapse continuing for many decades or perhaps centuries, with innumerable human and non-human casualties. This may in fact be the most likely path forward.

...