More than half of Australians oppose the Adani coal mine, new polling shows, as thousands of people prepare to take part in protests across the country.
Two-thirds of respondents also believe the Queensland government should veto a proposed $1 billion Commonwealth loan for a rail line to the Carmichael mine.
Almost 2200 people were quizzed in the ReachTel poll this week, with the results published as people gather to create human "Stop Adani" signs across 45 sites on Saturday.
Major rallies are planned for Bondi Beach, Brisbane, Port Douglas and Carlton North, with dozens of events also slated across each state and territory.
Climate campaigner Blair Palese said while both the Queensland and federal governments remained staunch supporters of the mine, the attitude of ordinary voters was clear.
"The Australian community is angry that $1 billion of public money could be handed to Adani for a mine which will wreck the climate and the reef," he said.
"They believe the Queensland government should stick to its promise and block the $1 billion loan to billionaire Adani for his private rail line."
Respondents to the ReachTel poll were told Adani wanted to build a new coal mine in Queensland, which the Indian company said would create local jobs.
They were also told concerns had been raised about the company's corporate track record and the environmental impact of the mine, before being asked if they supported or opposed the project going ahead.
A clear majority of people (55.5 per cent) either opposed or strongly opposed the mine, while 26.1 per cent said they supported or strongly supported it.
Almost one in five (18.4 per cent) were undecided.
Support was highest among Australian Conservatives, Liberal and One Nation voters, while Greens, Labor and Nationals voters were most keenly opposed.
Those polled were also told Queensland Premier Annastacia Palaszczuk made an election commitment that Labor would not spend public funds on Adani's private rail line for their coal mine.
People were then asked if the Queensland government should keep its promise and use its power to veto a $1 billion Commonwealth loan to Adani for the rail line.
Two-thirds of respondents (65.8 per cent) said they should veto the loan, while 17.7 per cent said they should not, with 16.5 per cent undecided.
The Stop Adani Alliance, which is organising the national rallies, says its membership has more than doubled since it launched in March this year, with more than 160 groups forming in that time.