I think that neither of the historical trend models are going to be realistic except by chance. Past performance doesn't guarantee future returns. Basically, I'm not sure that the past situations and solutions will be the same as the future situation and non-/solutions.
Also, this misses a big part of what's important to me. The standard of living should also be considered. Given that we can support 9 billion people, will each of them be as well off compared to if we were instead supporting half that?
Also, this misses a big part of what's important to me. The standard of living should also be considered. Given that we can support 9 billion people, will each of them be as well off compared to if we were instead supporting half that?