I don't think it really matters whether you believe in mankind induced climate change or not. Even if you do, the issue of climate change is a global one and anything that Australia does is totally and utterly irrelevant. Why?
Currently Australia emits 1.4% of the worlds CO2 emissions.
Even if all of Australia's CO2 emissions ceased completely today: The increase in China's emissions (at the current and future predicted rate) would make up for ALL of Australia's emissions in 6 months from now. And there's NOTHING we can do to prevent that happening. Nothing.
So ask youself:
Why should we, a country that has a natural economic advantage of low population, low cost (fossil fuel produced) energy, suddenly burdon ourselves with a Carbon tax that will achieve absolutely nothing, other than possibly destroy what little economic advantages we have now and cause dramatic economic harm? Just to "feel green" ? You've got to be joking right?
So, regardless of whether you believe in climate change or not, it just is not in all of our best interests to shackle ourselves with a Carbon Tax or ETS until China does something meaningful about it's emissions.