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Curious: do you have an answer? My guess: most people will give different answers. But there will be a substantial cohort of back-to-nature nostalgics whose answer is "the pre-industrial level".
One curious thing: if we gain the ability to control CO2 / GHG / temp levels, that creates a very different governance problem: how to decide at what level to set the temp? (And ocean acidification). I can imagine a future in which we have conferences on CO2 levels being too low
And people complain about the evil carbon capture / air-mining companies, driving CO2 levels down below 200 ppm, causing an ice age... when will it stop!
By that time, we'll be controlling the *weather* locally. Getting global parameters exactly right will be less important, and less contentious than at the present extremely crude level of relevant knowledge and technology.
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