Despite all of this, air quality is relatively high. Water quality is relatively high. Ecological preservation efforts have restored all sorts of habitats and saved species from extinction.
Gina Rinehart has become a billionaire in Australia by owning a massive coal mining operation. A lot of the coal is burned locally, but most is exported to Asia. Asia isn't forced to buy Australian coal. Asian countries could instead put a tax on dirty energy, and encourage cleaner energy. But some combination of reasons keeps that low in their list of priorities.
And even if they unfortunately wish to continue to burn coal, it would be possible to force the use of air scrubbers and purchasing purer grades of coal. But that isn't pursued for the same reasons.