6pm: Australia’s #ClimateStrike has wound up after an estimated 300,000 people took to the nation’s streets to demand action on global warming.

In Sydney, they marched from USyd; to Notre Dame; to UTS; through the city to The Domain; and back up to Hyde Park.

Organisers from School Strike 4 Climate say as many as 100,000 people joined the city’s rally – although NSW Police have the number at 50,000.

Olivana Smith-Lathouris had this wrap from Hyde Park.

3pm: The march continues through Hyde Park.

2pm: Sydney climate strikers have now blocked Macquarie Street as they march from The Domain, past Parliament House and on their way to Hyde Park.

1:30pm: At The Domain, a mother tells Travis Radford and Henry McGilchrist why she’s marching.

“I really want to show my daughter that it’s important to use our voice,” she says.

1:00pm: Thousands pack into The Domain in Sydney, where speeches are underway in support of climate action.

Our Pacific neighbours are amongst those most threatened by climate change. They’ve also joined the march.

The Sydney Climate Strike has begun. #ClimateStrike https://t.co/7lOX37N5cn

— UTS Journalism (@CentralNewsUTS) September 20, 2019

12:30pm: John Ferguson is at The Domain.

He says there are young and old; some in school uniforms; some who’ve taken time off university and work – all calling for the Morrison Government to take action on climate change.

So many students and workers have joined the #ClimateStrike that mobile and internet reception has struggled to keep up with the posts and images being shared around the world.

12:00pm: Marchers are still making their way to The Domain in central Sydney. Amaani Siddeek has this update.

Melanie Wong was among those leading the UTS contingent.

She describes what it’s like to be among the marchers.

11:00am AEST: University of Sydney students have joined UTS on their march towards The Domain.

UTS was the first university to declare a climate emergency, as Kate Atkinson reports.

It’s early morning in the Pacific. Soon the sun will rise on September 20th 2019. Good luck Australia, The Philippines, Japan and all the Pacific islands. You go first! Now lead the way!#fridaysforfuture #climatestrike #schoolstrike4climate
(NZ + many others go next week.) pic.twitter.com/u1pji4SySN

— Greta Thunberg (@GretaThunberg) September 19, 2019

10:50am AEST: University and High School students across Australia are taking to the streets right now, to march for their future.

They’re joining a global movement demanding governments take action on climate change.

Sydney is among more than 4000 cities around the world to host marches.

Global time zones mean it is also one of the first.

Journalism students from the University of Technology Sydney are covering the #ClimateStrike LIVE – you can follow their reports here.