John Hamparsum is one of countless farmers across Australia who have joined the Farmers for Climate Change Action social media campaign, painting yellow on their properties as "a sign to say we want action".

"It's to try and demonstrate to political leaders that people are concerned about the lack of climate action by our leaders and that we're calling on our government to actually set an example to the rest of the world rather than being laggard; set an example of developing strong climate action policy," he said.

"These average every day farmers, I think there's a belief that they don't believe in [climate change]. That's a myth because nearly everyone you talk to is very much on board or it's impacting their properties."

Read also:

Mr Hamparsum said farmers were "at the forefront of climate change" and were being directly affected.

"We're always going to have drought, no question about that, but the severity of drought and the extreme heat we're getting with it is making it harder to reliably farm in this environment," he said.

"This is our business. Our business is having a warehouse without a roof on it - we appreciate that it comes with risk - ... [but] farmers are frustrated. You get political leaders out there pretending there's no climate change and if there is, 'we're not going to do anything about it'.

"If it continues, the future for our children will be quite bleak."

Mr Hamparsum said instead of just painting his mailbox yellow or similar, he decided to use a life-saving symbol because "if you look at climate change and the impact it will have on the Pacific Ocean, they'll need a life ring".