I watched a very interesting documentary going back about 12 months ago now where this person, some highly acclaimed and respected something or other stated matter of factly that Australia is already grossly overpopulated and that this country alone can currently only comfortably accommodate 10 million people, less than half the current populatioin. I think he's bang on the money too given that 2/3 of the continent is virtually uninhabitable. So many people go on about how Australia has the least people per square kilometer in the world and that we can easily take in millions of refugees etc... there's a reason for that... because how many of us live in the Simpson desert? The coastlines of Australia are packed like sardines and the vast interior is sparsely populaed.
Australia is overpopulated.