Separating out the biosphere and anthroposphere for sake of argument.
Would an economic collapse be good or bad for the biosphere?
On the bad side we have:
- There are 2,000 or more protected species in the world right now. With economic collapse, every one of these would be back on the dinner plate. Expect a new era of extinctions.
- Lack of food will cause the mass migration of people from cities into the previously unspoiled countryside.
- Loss of the pill and condom will lead to increasing overpopulation.
- Loss of grid electricity, and metal and concrete, leads to the cutting down of timber for building material and fuel. Deforestation.
- I expect that economic collapse will not stop the manufacture of bullets and poison, they’re too useful in a post collapse society.
- The increase in slash and burn agriculture.
On the good side we have:
- Less global warming.
- Greenies have a chance to practice permaculture.
On the uncertain side we have:
- It’s not clear to me whether pollution would increase or decrease. Charcoal production, a major industry after economic collapse, is the dirtiest industry ever invented. Without catalytic converters and sulphur dioxide scrubbers even the greatly reduced transport and industry will yield more air pollution per unit. More faecal matter in our waterways would tend to offset less water pollution by industry.