A man paddling and pulling his kayak from Brisbane to Adelaide to promote the need for action on climate change says he is disappointed with the sceptical nature of outback Australians.

Steve Posselt, who is pulling his kayak along the Darling River road due to a lack of water, says that many rural people do not believe in climate change.

He says he did not expect so many people to doubt what the majority of climate scientists agree on.

"I've been astounded by the actual lack of belief on this trip," he said.

"Many people want to argue the issue about whether there is such a thing as global warming.

"You can talk to blokes in the pub and they say yep winters aren't what they used to be, they're a lot shorter.

"And you say, 'well do you believe in climate change? No, mate its just a cycle'."