Tanya Plibersek, the minister for the environment and water, indicated last year that she intended to reject the mine and formalized her decision on Wednesday.
She said it was the first time a federal environment minister had used their powers under environmental laws to reject a mine.
“The risk of pollution and irreversible damage to the reef is very real. The project would have had unacceptable impacts on freshwater in the area and potentially on fragile seagrass meadows,” Plibersek said in a video posted on social media.
She said that during the public consultation period, her department had received 9,000 public comments about the mine in just 10 business days.
The government, elected in 2022, came to power promising stronger action on the climate in a country still heavily wedded to fossil fuels.
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But its climate policies are rated “insufficient” by Climate Action Tracker, which found Australia is not on course to meet targets to limit warming to 1.5 degrees Celsius above pre-industrial levels.
The government has rejected calls from the country’s Green Party to turn down all new fossil fuel projects.
Fierce conflict is being waged over these plants
Central Queensland Coal, Palmer’s company, did not immediately respond to a request for comment.