Even though most of the land is desert or semiarid, Australia is self sufficient in supplying it's people with food

It is true that Australia is self sufficient in supplying it's own people with food. Even though the land is semiarid and a desert, they still are one of the world's major exporter of wheat, dairy products, and meat among other things. They are also a major exporter of wool for the world. The country relies on live stock and crop farming for their food supply.