Good_Egg wrote: ↑June 14th, 2024, 5:11 am
Yes, the environmental movement is full of "fixed pie" thinkers. Which is why Green parties drift to the left...
So what's wrong with the view of sustainability limits to the size of the pie ?
Consider land. With a few small exceptions, such as Dutch polders, the supply of land is fixed. And has been recognised as such since the beginning of economics. Did economic growth stop at the point where all the land was owned ? No.
is a resource that
Population growth and economic growth in the context of a fixed amount of agricultural and pastoral land has only been possible by increasing the productivity of the available land. But what if their are natural limits to the productivity that can be squeezed out of the available land?
There do seem to be such limits. For example, adding more fertilizer to crops only works up to a point, beyond which it is useless or harmful. And there are other problems with artificially pushing up productivity. For example, the use of antibiotics in farmed animals to raise production is causing problems with resistant super bugs that can be harmful to humans and to wild animals.
And overstocking on marginal pastoral land causes its degradation and makes it useless for further pastoral production. These are just a couple of examples which suggest that it may not be possible to keep increasing the size of "the pie" indefinitely.
And already, between one quarter and one third of GHG emissions come from agriculture. Further destruction of forests in the Amazon and elsewhere for grazing land is worsening this problem.
We will have to find answers to these problems if we want to keep growing the pie. Some will say that there is no reason to think that we won't find answers because we have always done so before. But that is an overstatement. Civilisations have died out before when they exceeded the carrying capacity of their land. Ancient Mesopotamian a case in point. At that time it didn't matter much for the overall human project if a civilization failed due to land degradation because there was plenty of unoccupied fertile land elsewhere. That is not the case today.
The solution to this problem is simple in arithmetic terms. If feeding eight billion humans exceeds the capacity of the land, then why not just decrease our population by reducing fertility rates? However, that is not a solution all are comfortable with for economic and other reasons. If we cannot do it that way, then we are going to need a technological fix. What that would look like is far from clear. So a solution may not be simple after all. But we will need to find one, nonetheless.