Laura Kirwin, Izzy Raj-Seppings, Ava Princi and Liv Heaton pose outside The Federal Court of Australia in Sydney, Australia. File/AP

Last year's legal win by a group of high school children had been hailed by environmental groups as a potential legal weapon to fight fossil fuel projects.

But the federal court found in favour of an appeal by Environment Minister Sussan Ley, deciding she did not have to weigh the harm climate change would inflict on children when assessing the approval of new fossil fuel projects.

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The judgement overturned a July 2021 ruling by a lower court that found the minister had a duty to "avoid causing personal injury or death" to under 18s due to "emissions of carbon dioxide into the Earth's atmosphere".

Anjali Sharma, 17, who launched the legal action in 2020, said the minister's successful appeal had left the students "devastated".

"Two years ago, Australia was on fire; today, it's underwater. Burning coal makes bushfires and floods more catastrophic and more deadly. Something needs to change," she said.

Izzy Raj-Seppings, 15, said the court had accepted that young people would "bear the brunt of the impacts of the climate crisis", which she described as an important step in climate litigation.

However, the federal court found emissions from the mine at the centre of the case -- Whitehaven's Vickery coal mine -- posed only a "tiny increase in risk" to the students.

Minister Ley welcomed the verdict.

"The minister always takes her role as the environment minister seriously," a spokesperson said in a statement.

Agence France-Presse