- The First Australians grew to a population of millions, much more than previous estimates. The establishment of populations in every part of this giant continent could have occurred in as little as 5,000 years. And the entire population of Sahul could have been as high as 6.4 million people. https://theconversation.com/the-first-australians-grew-to-a-population-of-millions-much-more-than-previous-estimates-142371 41 comments science