There is so much debate about what the Earths carrying capacity is. Misses the point: the more humans the less of everything else.
We must be in overshoot if you look at fisheries failing, arable land and topsoil loss, fossil fuel use vs discoveries etc... Still there are those pushing for population growth so they can make more money.
We aint gonna get to 9 Billion, let alone 10.
Sad.
JOW