Utter nonsense (other than you not having kids, that's your choice).
Market forces will in fact solve the "problem" (to the extent it is one) of excess CO2 output. If it is finally determined that CO2 based warming is problematic, the solution will be advanced technology, including high-intensity energy sources like nuclear power. In the absolute worst case, orbital sunshades or other mitigations will be used to decrease insolation.
The laughable thing about this article is the idea that any amount of spending by the Australian government to "take decisive action on climate change" would help. If Australia completely stopped producing CO2, it would have no measurable effect on water temperatures around the Great Barrier Reef, especially since the argument is that current CO2 levels are causing the problem. Then there's the fact that Australia is a minor contributor to global CO2 emissions...
What's needed on "climate change" is a lot more rational thought, and a lot less hysteria.