"I expect we would find that we could support a lot more people...

"I expect we would find that we could support a lot more people in Australia"
And what's point of supporting more people?
There isn't any.
You need to wake up out of stone age when 'more' was better because it made survival of the species more likely.
The opposite is the case now.
Each and every other species has sufficient instinct to limit its own numbers, not so the human species which has turned into a ridiculous pest.
Overpopulayion is the underlying reason for wars, mass-killings, gas chambers, all sorts of suffering.
Halve the population visa one-child families, then halve it again.
Less is best. Basta.
Actually K Henry has already been silenced, no search results in The West and News.com.au.
How strange.
Nature needs to come up with more flooding, earthquakes, wars that sort of stuff to confirm population limits have been violated ages ago.