Australia's High Court Blocks Major Coal Mine Expansion Over Emissions

Australia’s High Court has ruled against the planned expansion of Mach Energy’s Mount Pleasant coal mine, concluding that the relevant planning authorities did not adequately account for the project’s greenhouse-gas emissions. The challenge was brought by a community group led by two retired science teachers; media reports including Al Jazeera were cited in coverage of the decision. A judge criticized the New South Wales Independent Planning Commission for focusing on what the ruling described as a small fraction of the project’s emissions. Central to the court’s finding was the treatment of Scope 3 emissions — the greenhouse gases released when the coal produced is burned by end users. The court said regulators failed to consider whether conditions could be imposed to minimise the project’s total emissions “to the greatest extent practicable.” Lawyers for the plaintiffs said the ruling confirms that authorities cannot ignore the causal chain linking a project’s emissions to real-world local climate harms, and that the decision will be relied upon by other courts and planning bodies in Australia and studied internationally. The Mount Pleasant proposal would have extended the mine’s operating life to 2048 and added about 406 million tonnes of coal, effectively doubling output compared with existing plans. The ruling therefore not only halts that expansion but may also change how similar proposals are evaluated, particularly where downstream emissions are material to environmental assessments. Australia is among the world’s largest coal exporters by volume and led the globe last year in coal export value, with reported export revenues of $43.7 billion. The country has seen growing climate activism and policy efforts aimed at cutting emissions, developments that have already placed increased scrutiny on its fossil-fuel industries. Observers and legal experts say the High Court’s decision could accelerate that trend by embedding Scope 3 considerations into domestic planning and environmental law.