From the South Pacific to the edge of the Arctic Circle, students mobilised by word of mouth and social media skipped class Friday to protest what they believe are their governments' failure to take thorough action against global warming.
The coordinated 'school strikes,' were inspired by 16-year-old Swedish activist Greta Thunberg, who began holding solitary demonstrations outside the Swedish parliament last year.
Since then, the weekly protests have snowballed from a handful of cities to hundreds, fuelled by dramatic headlines about the impact of climate change during the students' lifetime.
Thunberg, who was recently nominated for the Nobel Peace Prize, a rally in Stockholm that the world faces an "existential crisis, the biggest crisis humanity ever has faced and still it has been ignored for decades by those that have known about it.
"And you know who you are, you that have ignored this and are most guilty of this," she said, as protesters cheered her name.
Friday's rallies were one of the biggest international actions yet. Protests were underway or planned in cities in more than 100 countries, including Hong Kong; New Delhi; Wellington, New Zealand; and Oulu, Finland.
In Berlin, police said as many as 20,000 protesters, most of them young students, gathered in a downtown square, waving signs with slogans such as "March now or swim later" and "Climate Protection Report Card: F," before marching through the capital's government quarter with a stop in front of Chancellor Angela Merkel's office.
In Poland, thousands marched in rainy Warsaw and other cities to demand a ban on the burning of coal, which is a major source of carbon dioxide. Some wore face masks as they carried banners that read "Today's Air Smells Like the Planet's Last Days" and "Make Love Not CO2."
About 50 students protested in South Africa's capital, Pretoria, chanting "There's No Planet B." One protester held a sign reading "You'll Miss The Rains Down in Africa."
Last month, lawmakers in the northern Swiss canton of Basel symbolically declared a "climate emergency."
"A lot happens on social media because you can reach a lot of young people very quickly and show them: look there's lot of us," she told The Associated Press. "There's a very low threshold so we reach a huge number of people."
"That's why they need our support," he said. "If we do nothing then parts of this planet could become uninhabitable by the end of the century."
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