Record temperatures in Oz

While denialists witter on about how cold it is in the USA ( Alaska is warmer than Florida) it's mid-summer here in Oz and we're having record, record heat.  That  by itself of course doesn't prove there's global warming, but if we know (and we do) that global temperatures are rising rapidly, then a record heat wave is significant.  And it's likely to be followed by more records being broken.  And then even more.  How long before significant chunks of the world become uninhabitable in summer?