So David Evans is a scientist who worked for the Australian Greenhouse Office, as one of the country's leading climate change experts.
But once a global warming alarmist, he's now a skeptic.
He now believes that "The debate about global warming...is full of micro-thin half-truths and misunderstandings."
And he blames it all on greed, vanity and careerism.
Because, he says, "the gravy train was too big, with too many jobs, industries, trading profits, political careers, and the possibility of world government and total control riding on the outcome."
So rather than admit exaggeration, the alarmists chose the path to hysteria.
This reveals a truth I've tried to explain to my global warming pals. That the only experts you can trust are the ones who keep their traps shut.
As a health journalist - I learned that the good doctors were the quiet ones. And those guys always viewed the blabbermouths as opportunists who sacrificed science in favor of ego and influence.
And this is why two decent people can read the same article, and reach two different conclusions.
For a person unfamiliar with the professional and personal motives behind the science, you will buy into the dire predictions.
But for a health hack like me, I knew you could extrapolate any possibility into a craze or a panic, for personal gain. I saw it a thousand times with vitamins, fitness gadgets and health scares. Man-made global warming was no different.
The good news: eventually hysteria dies down. the question is, how much damage does it leave behind.
Did overwrought concern obliterate legitimate worry?
My suggestion: restart the debate, and find out.
And if you disagree with me, then you sir are worse than Hitler.
Mike Tobin! (first time!)
and comedian Ryan Reiss!