Worldwide concern has escalated since U.S. President Donald Trump abandoned the global Paris Accord on climate change and took a series of steps to dismantle environmental protections including moving on Thursday to block stricter vehicle emissions standards in California.
The strike, which is organized by The Climate Strike Coalition, is meant to kick off a week of organizing events to fight climate change.
Meanwhile, students at the Royal Melbourne Institute of Technology have reportedly been told they will be given full marks on an assessment if they take a selfie at one of the protests.
The Sydney protest was largely peaceful but police arrested one non-participant on the sidelines of the event.
The Hertfordshire branch of the UK Student Climate Network has also organised strike action in the Stevenage Town Square from 9am to 10.30am and at the same time in St Albans' city centre.
Because this is a youth-led protest, New York City has offered blanket permission for students to miss school.
Year 12 students at Blackwattle Bay Secondary College are about to graduate, but first they have a more pressing date: striking for climate change.
At midday alarms were sounded to coincide with alarms across the world to highlight "the need to wake up to the climate crisis".
He did, however, say that exam dates were scheduled at the beginning of the school year and students would need to make a decision.
"I don't know if we're on the frontline of the fight against climate change, but I hope so".
"When we come out here".
Children listen to speakers as they attend the Global Climate Strike
So go outside and protest! "The momentum from today shows that any candidate for the American presidency who wants to win our generation's votes must commit to making the Green New Deal the number-one priority of their administration".
And it has certainly not been supportive of the student strikes, falling firmly into the category of "kids should be in school" and not fighting passionately for the future of the planet.
From Canberra to Kabul and Cape Town to Berlin and across the globe, hundreds of thousands of young people took the streets Friday to demand that leaders tackle climate change in the run-up to a United Nations summit.
"It is so important that people take a stand. Governments say they recognize this but they're not moving fast enough".
But some government MPs have voiced disapproval of the strikes.
Business, energy and clean growth minister Kwasi Kwarteng said he could not endorse children leaving school to take part, though he insisted "their voices are being heard" by the Government.
Just as with movements like Extinction Rebellion, such a disruption is meant to trigger a mass intervention by both governmental and non-governmental bodies, and this will have to come from a coordinated and consistent pressure campaign numbering in the millions.
Students' participation in events such as climate rallies has been allowed, but they are asked to have their parents sign an excused absence from school, Watters said.
"If you can't be in the strike, then, of course, you don't have to", Thunberg told Teen Vogue. Demonstrators called for their country, the world's largest exporter of coal and liquid natural gas, to take more drastic action to reduce greenhouse gas emissions.
The Primary Principal Schools Association's Malcolm Elliott said the protest did raise safety issues.
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