Which isn’t even remotely true. Australia has wild representatives of rice, millet, teff, taro, Macadamia, Terminalia, sunflower, nightshades, grapes, banana, numerous legume species and a plethora of other genera that have been widely domesticated elsewhere. In addition there are numerous endemic plants that would be at least as domesticable as the ancestors of other current domesticates. The idea that Australia doesn’t have any plants that are suitable for agriculture can’t possibly be justified objectively. Diamond had to support his (rather silly) hypothesis by restricting his search for agricultural plants to only grasses and only those native to the tiny Mediterranean climatic zone in the southwest. In doing so he ignored the fact that there are 10, 000 yo agricultural societies within 200 miles of Australia that established in zones where the flora is >90% similar to that of northern Australia.
Any claim made that Australia lacks domesticable plant simply isn’t based on fact.
None of the surviving ones, certainly. When humans arrived there were numerous likely domesticable species. In this regard Australia is no different to the Americas, where the domestication candidates were also exterminated. Nonetheless the Americas did develop agriculture on at least two separate occasions. So the idea that an absence of domesticable animals was the barrier to developing agriculture is even less supportable than the idea that it was a lack of domesticable plants.
That’s just nonsense. Australians have been trading domesticates with other cultures for at least 4, 000 years that we know of, and the truth is that there has probably never been a year when such trade wasn’t engaged in. We know that domesticates were traded 5, 000 years ago because we have the fossil remains: we call them dingoes but they are just a Malaysian dog breed. And we know from the distribution and genetic drift of various parasites that these domesticates were regularly traded both ways for millennia. In addition to dingoes we know that Macassans brought pigs and domestic rice to Australia and propagated them here. We don’t know how long his went on but there’s no reason to assume that it was less than 1, 000 years. Human beings of both groups also travelled back and forwards between Australia and Indonesia/Malaysia so the practice of agriculture was well known within Australia.
The knowledge of Australians was neither more nor less comprehensive than that of any other HG group anywhere else in the world and was no better able to allow them to live. Nonetheless people everywhere else found an imperative to settle despite having this same knowledge.
Cite! Seriously, name one South American rainforest group that doesn’t practice slash and burn farming? The fact is that humans can’t live in rainforest. We’d starve to death if we tried. To live in rainforest environments we need to clear the forest so that we can produce enough food to simply stay alive.
As for why Australians never developed agriculture, Flannery’s explanation is the only one I’ve heard that makes sense. In brief, Australia has a very unreliable climate, much more so than anywhere else in the world. Normal climate consists of several years of drought terminated by floods, followed by maybe 5 “average” years before the droughts return. It’s impossible to establish agriculture under those conditions. The English imported agriculture, but it still failed often enough that the populations was dependent on food exports. Agriculture only became viable in Australia when it became practiced on a wide enough scale that catastrophes that wiped out thousands of square kilometres of cropland could be counteracted by food imports from unaffected area.
You can’t establish agriculture in that manner though. The first people to try agriculture would have seen their food supply destroyed by the first drought or flood and had no recourse but to return to a HG lifestyle, with the concommitant starvation if the population had increased in the interval.
IOW its’ not because of alack of available domesticates or the people having different needs to every other place on the planet or the paucity of the soils. It’s simply because to use agriculture in Australia you need a large population with well established bulk trading networks. But you can’t have a large population with well established bulk trading networks until you are already practising agriculture. Catch 22, and so agriculture never developed.
