Not Australia, but a recent study[0] confirmed the Pakistan flooding (in which 10% of this country that's larger than Texas is underwater) links to climate change. Historically, tying events like this to climate change in a way that lives up to scientific rigor has been quite difficult, but techniques and available data have been improving. Allowing us to tie many extreme weather events to climate change, including: the seemingly never-ending droughts in the Horn of Africa, Mexico, and China, flash floods in West and Central Africa, Iran and the inland United States and searing heat waves in India, Japan, California, Britain and Europe. They refrained for making estimates for the Pakistan flooding, but earlier this year scientists found that the heat that scorched India and Pakistan this spring had been 30 times as likely to occur because of greenhouse emissions. July’s extreme heat in Britain had been at least 10 times as likely
If you're looking for a mechanism of action for how climate change can make monsoons more deadly, it's likely to do with increased evaporation of water due to increased temperatures and the fact that hotter air holds more moisture
I will take a leap of faith and assume this isn't intended as a joke.
Yes, CO2 traps heat in air, trapped heat in air means hotter surface and hotter air, most of earth's surface is water, hotter surface means more water vapour, hotter air means more capacity to carry water vapour, water vapour forms clouds, clouds lead to precipitation.
Climate change is leading simultaneously to two issues: not enough water, too much water.
The former is obvious why: more water in air, means more rain, combined with more heat means more and bigger hurricanes/typhoons etc..
At the same time, due to more complex effects, droughts occur. Basically that is happening in regions where wind and ocean currents are not transferring moisture in to the region, but heat is causing evaporation. Other effects also contribute (eg. reduced snow pack in mountains, leading to there being less ice to melt to keep rivers flowing).
