Thousands of Australian children are walking out of school to attend protests, calling for action on climate change.
Up to 50,000 students are expected at School Strike for Climate rallies across the country.
It's the latest grassroots campaign by young people pushing for action on the climate crisis.
Australia has long faced criticism for refusing to set more ambitious emissions targets.
David Soriano, a 17-year-old attending a Syndey rally told the BBC he was worried about the future and wants the government to see the youth movement "as one to be reckoned with".
"We're scared and concerned. We're doubtful that there might not be a future in store for the generations after us, and even our own generation," he said.
Mr Soriano said he had experienced increasing heatwaves and low air quality, in Western Sydney where he lives.
The protesters are also calling for no new coal, oil and gas projects in Australia, including the controversial Adani mine.
India's Adani Enterprises has attracted criticism in parts of Australia for developing a new thermal coal mine.