Perhaps it will make sense to worry about depopulation when we've had several decades of reductions in human population. Would it be a bad thing if the world ha

Perhaps it will make sense to worry about depopulation when we've had several decades of reductions in human population. Would it be a bad thing if the world had 2 billion people in the year 2300? Would it be better to have a slow reduction in population because the TFR was below 2 for a couple centuries, or a crash when we exceed our planet's carrying capacity? Hand-waving about "geoengineering will fix it" doesn't seem like a good faith argument, given that it has been described as very risky by well informed people.