some will tell you that the hot weather in Australia is no big deal. but this article points out that earlier heat events in Australia in the 20th century did not stay that hot for this long.
we have a word: "unprecedented"- it means "this never happened before." Whenever you see that in terms of hot weather, it is another piece of evidence. the evidence piles up. One hot day does not prove global warming, but a century of increasing temperatures across a planet do.