One optimistic way of looking at it is that the models for success already exist. The US 2050 target for per-head CO2 emissions is to get to the same as France

One optimistic way of looking at it is that the models for success already exist. The US 2050 target for per-head CO2 emissions is to get to the same as France today. And France has just as industrial an economy, and a similar population density to a lot of US states. So, the idea cutting emissions is impossible or will inevitably lead to massive damage to the economy or reductions in quality of life is obviously not correct. And that doesn’t even take into account the technological developments which can occur to make the transition easier again. The problems are to do with politics, economic models, and technology development, there are no fundamental barriers. Also, the economy functions at scale, so if the majority of rich countries follow a transition other countries will likely follow by default. It’s a matter of pushing enough technologies over the tipping point where they take over even if you assume the value of the atmosphere is zero.