The Queensland floods are not related to anthropogenic global warming

But there were even greater floods in 1841 and 1893. This is well before any possible Anthropogenic Global Warming, which began, according to its adherents, in 1945.

And there were many other floods of lower magnitude, long before the supposed advent of Anthropogenic Global Warming as shown in the BoM graphs.

3. A third problem is that just a few years ago, global warming was blamed for causing droughts. This opinion was extolled during the last drought especially by Tim Flannery, another non-expert. 

In 2003 Professor Karoly  published, under the auspices of the World Wildlife Fund, a report that claimed that elevated air temperatures, due to CO2, exacerbated the drought.

 “...the higher temperatures caused a marked increase in evaporation rates, which sped up the loss of soil moisture and the drying of vegetation and watercourses. This is the first drought in Australia where the impact of human-induced global warming can be clearly observed...”

and

“This drought has had a more severe impact than any other drought since at least 1950.... This is the first drought in Australia where the impact of human-induced global warming can be clearly observed.”

So Anthropogenic Global Warming can apparently be used to explain any current disaster.  Any hypothesis (like AGW) that uses the same mechanism to explain opposite effects is untestable, and therefore not science.  Its models are totally useless for prediction.

In brief, there is no reason whatever to associate the Queensland floods with global warming (if it is occurring at all).  It is even more ridiculous to blame it on a trivial increase in atmospheric carbon dioxide.

Unfortunately the floods will come again.  You might like to look at the data on the BoM website and try to determine the return interval for yourself.  It is really a bit of a guess. 

But the citizens of Queensland would be well advised to implement adaptation policies that have a more realistic impact than trying to reduce CO2 production in the vain hope that it will, like repeating some magic spell, make the nasty problem go away.