Otherwise known as Hadley cell affected rainfall patterns. The big issue for Australia is that we have no equivalent to the northern hemisphere's "move north" option. If we tried to move south, we'd be in the drink. Adelaide is at the equivalent latitude to Los Angeles. I've heard some people suggest that their option is to move to San Francisco. To move 615 kms due south of Adelaide is not an option, there's no there there.australia lies on a world wide desert belt---both north and south latitudes of roughly 25-33 degrees latitude----
Plant trees? There are places where trees have never grown more than a few feet high. The Nullarbor Plain may be the world's largest single stretch of limestone - 200000 sq km. More importantly, its name is not an indigenous word as many people think - it's Latin for no tree. (null arbor) No point trying to grow trees where they've never grown before.