A bet allegedly made by former Prime Minister Tony Abbott that has been slammed as "outrageous" and "revolting" after details of the interaction were made public on Tuesday.
Author Cassie Flanagan Willanski wrote in The Guardian that she bumped into the Liberal MP in a Manly cafe and decided to make her views on the need for climate action known.
Ms Flanagan Willanski said she "just want to go on record as having asked you to take climate change seriously" but claims Mr Abbott responded by offering to bet her $100 that the climate would not change in a decade.
A picture of a piece of paper with Mr Abbott's signature accompanied the article.
"Afterwards I donated $100 to the Australian Youth Climate Coalition. I gave away my winnings 10 years in advance because I knew I’d won this ridiculous, offensive bet as soon as it was made," Ms Flanagan Willanski wrote.
On social media, voters have responded in disbelief that Mr Abbott would make the bet with a complete stranger.
"Only the hardest core denier would make this bet. Tony Abbott is certain to lose," University of Sydney professor Tim Stephens tweeted.
"The level of contempt this shows Abbott to have for the rest of us is spectacular," wrote another user.
Mr Abbott has long been viewed as a climate change sceptic, telling reporters during his campaign launch last month that the "so-called settled science is not quite as settled as people say".
The issue has become a key battleground in Warringah, as Mr Abbott goes up against to win the seat he has held since 1994.
The need for climate action has been seized upon by former Olympian Ms Steggal as her main policy platform.
Mr Abbott's office has been contacted for comment.
