Updated 0158 GMT (0958 HKT) September 21, 2019
From London to New York City and from Perth to Paris, climate activists are taking part in a global general strike on Friday in what is expected to be the biggest day of climate demonstrations in the planet's history.
Some of the first protests were held in Australia and organizers have said "well over" 300,000 people gathered at more than 100 cities and towns across the country. Melbourne hosted the biggest march, according to organizers, with 100,000 people turning out, while 80,000 rallied in Sydney and 30,000 in Brisbane.
The Global Climate Strike is the third in a worldwide series of climate rallies organized by school students, and led by 16-year-old Greta Thunberg. Protestors hope to put pressure on politicians and policymakers to act on climate issues.