Not really, not all land can be used to host people. We need space to grow food, produce energy, have factories and offices, infrastructures... We're already us

Not really, not all land can be used to host people. We need space to grow food, produce energy, have factories and offices, infrastructures... We're already using more than what the entire emerged land can provide us each year (with the help of massive supplies of fossil fuel and derived products, which will eventually run out). If we want to offer everyone a western lifestyle while being sustainable on the long run, the optimal world population is indeed estimated at around 1.5-2 billions (world population of 1950), and definitely under 3 billions. https://www.theguardian.com/environment/2012/apr/26/world-population-resources-paul-ehrlich https://www.theguardian.com/environment/2012/apr/26/world-po... Or just Google "Optimal world population".