When Williams reminded Turnbull he was calling conduct by members of his own party dangerous and idiotic, Turnbull did not waver.
"Well, of course, it is dangerous and idiotic not to be taking the strongest action to reduce your greenhouse gas emissions," Turnbull said.
Everyone has been aware of this except for those who, well, the climate change deniers are aware of it, but they choose to deny reality."
He was replaced by Scott Morrison, who has minimized climate change and been criticized for his response to the fires.
"Well, if we don't act, if we don't act, a wealthy advanced economy facing the harsh reality of climate change, if we don't act and show leadership, why would anyone else act?"