Absurd. How can anybody predict what will happen in 50 years' time? There will always be unpredicted events like the coronavirus to throw all predictions into a cocked hat.
What, for instance, would the eventual arrival of practical thermonuclear fusion bring about? Would limitless energy requiring only water as a feedstock make a difference?
Report author Pradeep Philip, who was a policy director for former prime minister Kevin Rudd, said there was also a lot to be gained if warming was kept below 1.5 degrees and Australia achieved net zero carbon emissions by 2050.
"If we do act over the next few years then in just 50 years there is a benefit to the economy of $680 billion," he said.
"We'll have an economy 2.6 per cent bigger, generating 250,000 jobs, so this tells us if you are pro-growth and pro-jobs then we need to act on climate change now.
"We know that there are new sectors around renewables, hydrogen, electric vehicles that can be created."
Queensland, the Northern Territory and Western Australia will feel the effects most acutely, with trade, tourism and mining some of the industries most exposed to the effects of climate change.
"As things get hotter because the planet warms up, it makes it really difficult for those labour-intensive industries to work," Dr Philip said.
"If you work outside, in construction, higher average temperatures make it quite unbearable to work, so we get a loss of productivity, we get adverse health affects, and this translates across the board into retail, manufacturing, transport and mining.