The former head of the powerful National Australia Bank, Cameron Clyne, has weighed into the increasingly toxic debate over Australia's climate change policy with a salvo directed at what he calls the "wilful ignorance and blindness" of political leaders and some sections of the business community.
And he warns that many in business are afraid to speak up because "you put your head out there and it's going to get smashed off".
Mr Clyne says he accepts the "overwhelming" scientific consensus that climate change poses an "existential" threat "quite unlike any that we have faced before".
But he argues that even those who don't accept the science should grasp what he describes as the overwhelming economic case for moving away from fossil fuels and towards renewable energy.
The speed of the renewables revolution is "staggering", he says, and it would be "economically reckless" for Australia to remain coal-reliant.
"The Abbott government [which has attacked wind power and reduced support for small-scale solar] is clearly not leading Australia in the direction that's needed," he argues. "You can be as angry as you like with environmentalists and 'environmentalism' but from an economic point of view, it still wouldn't make sense to be so heavily addicted to this polluting business as Australia is."
He said business leaders shared his view that Australia should move to a market-based carbon trading scheme but feared speaking out.