If you take a 'planetary boundaries' view [1] we're outside of the safe operating limits for several factors: Extinctions, land system change, novel entities, biogeochemical flows, and climate change. 'Solving' emissions would only really address one of those (climate change).

Take a theoretical world where population was drastically lower (or individual consumption is hugely slashed amongst the top consumers): We would drop within the safe boundary for all limits simultaneously, because the underlying multipliers for all of them are number of people and individual consumption.

[1]https://www.stockholmresilience.org/research/research-news/2...