There's a difference between some people living in hard places supported by outside help, and whose ecosystem has had long durations to adapt, and many people seeing their normal weather change extremely quickly and their ecosystem stressed at incredible rates.

Humanity will survive, there will be survivors. Our current civilization maybe not, it has hyper optimized itself for money to the point of fragility.

Just curious, Australia being mostly desert, if the rest of the planet became similarly barren, would it still work out? I don't know how food-independent Australia is...