All of the things that you listed though would be solved with a vastly reduced population. Our population growth in the last 150 years alone is just absurd[0]. I agree, 10billion is just a matter of time but even if these 10 billion people lived as sustainably as possible, the lower economic countries will develop and begin requiring more and more resources. Even a fully vegan lifestyle for 10 billion people would cause a huge amount of damage in order to deforest and irrigate produce - far more damage than if world population was 500 million and living with our current western values

[0] https://en.wikipedia.org/wiki/Human_overpopulation#/media/Fi...