“We wish she’d been here, but the movement has to carry on without her. We’ve got to send our message and pressure politicians ahead of the climate summit,” Marianna Louca, 14, said in Lisbon.

Friday’s climate strikes were expected to take place in 2300 cities in 153 countries around the world, according to the climate campaign group Friday For Future.

Thousands of demonstrators attend a protest climate strike ralley of the 'Friday For Future Movement' in front of the Federal Administrative Court building in Leipzig, Germany, on Friday.

Thousands of demonstrators attend a protest climate strike ralley of the ‘Friday For Future Movement’ in front of the Federal Administrative Court building in Leipzig, Germany, on Friday.Credit:AP

The protests come as experts warn that global temperatures could rise sharply over this century with destructive consequences after greenhouse gas emissions hit record levels.

Outside Parliament in London, protesters flew a giant blimp in the shape of a baby with “Guess my weight in CO2” written on its vest.

Students take part in a "Fridays for Future" climate change rally in London. The UK goes to the polls on December 12. The youth climate strike movement started in August 2018, led by the Swedish teenager Greta Thunberg.

Students take part in a “Fridays for Future” climate change rally in London. The UK goes to the polls on December 12. The youth climate strike movement started in August 2018, led by the Swedish teenager Greta Thunberg. Credit:Getty Images

Other protests took place in Mumbai, Tel Aviv, Vienna and Frankfurt. In Bangkok, young people chanted: “No more coal, no more oil, keep the carbon in the soil”, and staged a “drop dead” flash mob.

In Warsaw, activists, some in gas masks, waved banners saying: “Save our planet” and “Poland without coal 2030”.

A protester holds a placard as he takes part in a Global Climate Strike protest in Tokyo on Friday.

A protester holds a placard as he takes part in a Global Climate Strike protest in Tokyo on Friday.Credit:Getty Images

In Berlin, protesters in swimming costumes dived into the chilly river Spree, holding up a white box in a symbolic attempt to rescue the government’s climate change package.

Activists protested at Amazon sites around France in a backlash against the annual Black Friday shopping event driven in part by environmental concerns.

Several dozen protesters staged a dawn sit-in outside an Amazon building in the Clichy district of Paris, holding a sign saying: “No to Amazon and its world.”

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In Australia, students in Sydney and other cities walked out of class, saying more should be done to combat the country’s devastating bushfire crisis, which many see as a result of climate change.

Holding home-made signs, including “The climate is changing, why aren’t we?”, demonstrators in Sydney accused the government of inadequate action in addressing the bushfire crisis. Smoke from bushfires in New South Wales state formed a haze overhead.

Australian Prime Minister Scott Morrison denies his government is not doing enough on climate change.

Student activists from School Strike for Climate Australia (SS4C) hold a 'Solidarity Sit-down' outside the office of the Liberal Party in Sydney, on Friday.

Student activists from School Strike for Climate Australia (SS4C) hold a ‘Solidarity Sit-down’ outside the office of the Liberal Party in Sydney, on Friday.Credit:AAP

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