Hundreds of thousands of students around the world walked out of their schools and colleges Friday in the latest in a series of strikes urging action to address the climate crisis. According to event organisers Fridays for Future, over 1664 cities across 125 countries registered strike actions, with more expected to report turnouts in the coming days.

The “School Strike for Climate” movement was first started by Swedish teenager Greta Thunberg, who began her strike outside the country’s parliament in Stockholm in August 2018 and has said that she will continue to strike until Sweden is aligned with the goals of the Paris Agreement. Since then, her singular action has spread into an international climate movement, organised by young people around the world. This strike followed the last co-ordinated event on March 15, which saw over 1.6 million people across 133 countries turn out at demonstrations, according to organisers.

Thunberg was recently profiled on TIME’s global cover as a Next Generation Leader, along with nine other people shaping the world’s future. “This is not about truancy or civil disobedience, this is about the climate and the ecological crisis, and people need to understand that,” Thunberg told TIME in Stockholm, a couple of weeks ahead of the global strike.

“May 24 is the last chance to affect the E.U. elections. Politicians are talking about the climate and environmental issues more now, but they need more pressure,” she said. Voting across the European Union takes place May 23–26, where the 751 representatives of the European Parliament will be elected by citizens across the continent. Recent polling suggests environmental issues and policies tackling climate change are high on the agenda for voters considering who to elect. (European Parliament election results are out and the Greens have made gains, winning 69 seats, 17 more than the previous election, out of 751 seats – Note from Editors.)

The school strike movement has emerged in tandem with other environmental movements worldwide. The British-based direct action group Extinction Rebellion occupied major locations in London for ten days in late April, and their first demand, for the British government to declare a state of “climate emergency,” received approval from parliament on May 1. And in the US, the young activists of Sunrise Movement have pushed to transform climate action into a political reality by calling for a Green New Deal, attracting the support of several legislators and 2020 Democratic presidential candidates.

While Thunberg is well-known worldwide, she says it is the strike organisers in each country that she looks up to. “Young people who are in developing countries are sacrificing their education in order to protest against the destruction of their future and world,” she told TIME. “They are the real heroes.” Photos and videos from strikers in the eastern hemisphere started flooding social media in the morning, ranging from Seoul, South Korea to Auckland, New Zealand, and later in the day images of crowds surfaced in European cities such as Berlin and Paris, where organisers say an estimated 23,000 turned out to demonstrate.

Here is a look at some of the places around the world where young people took action on May 24.

Sweden: Thousands of students and young people took part in Friday’s strike marching through the streets of Stockholm. While there’s an acknowledgement that the strikes have placed the climate crisis back on the agenda in Sweden, for Thunberg it is not enough—her focus is on the global carbon emissions, which continue to rise. However, in the nine months since she first started her strike, her cause has galvanised support from a wide cross section of Swedish society, with grandparents and scientists turning out to support the strike on May 24.

Philippines: In the Philippines, one of the countries most vulnerable to climate change, organisers say there were strikes in at least fifteen cities. In recent years, the archipelago of islands has been hit by a series of extreme weather events, such as Typhoon Haiyan (known as Super Typhoon Yolanda in the Philippines) in 2013.

Australia: Australia has just experienced its hottest summer on record with the country’s farmers facing a punishing drought, and recent research has shown that warming seas are preventing the Great Barrier Reef’s ability to regrow. As well as strikes in Sydney, around 1000 activists staged a die-in in the heart of Melbourne’s business district just after lunchtime, “acting as physical reminders of Earth’s sixth mass extinction which scientists have attributed to anthropogenic climate change,” organisers Extinction Rebellion Australia told TIME. Young people also gathered outside Parliament House in Perth, Western Australia, a state where mining accounted for 85% of exports in 2017–18.

India: In Delhi, schoolchildren marched carrying a banner referring to the Intergovernmental Panel on Climate Change (IPCC), the leading international body for the assessment of climate change. In October 2018, the IPCC stated that the impact of a 1.5C increase in global temperatures over pre-industrial levels would “disproportionately affect disadvantaged and vulnerable populations through food insecurity, higher food prices, income losses, lost livelihood opportunities, adverse health impacts, and population displacements.”

Germany: With more than 218 strike events listed on the Fridays for Future website, Germany is expected to host more events on May 24 than any other country in both big and small cities. Recent polls have shown that German voters think climate and environment protection are the biggest challenges for the future of the EU, ahead of other issues such as migration.

United Kingdom: Hundreds of school children gathered outside the UK Houses of Parliament, chanting and holding the inventive placards that have become hallmarks of the strikes. The scene was replicated at cities across the UK.

South Africa: Along with Nigeria, Kenya and several other countries across Africa, students and young people in South Africa organised actions on May 24 and 25 to coincide with Africa Day, commemorated on May 25. As part of a continent-wide campaign #AfrikaVuka, organisers are demanding that local leaders “commit to building a fossil free Africa that puts people and justice before profits.”

Support for the climate strikes

Adults have backed the school strike movement, with several prominent thinkers and activists including Naomi Klein, Bill McKibben and Margaret Atwood supporting the movement’s next event, a global strike on 20 September, saying that “disrupting our normal lives is the only way to secure our future.” Leading scientists and academics had also previously signed an open letter in support of Greta Thunberg and the school strike movement in February.

While Thunberg may have started her strike alone, May 24 proved that people all around the world are in solidarity with her and willing to spread the message. “I’m not planning to stop this movement, and I don’t think anyone else is either,” she told TIME. “We have to start acting now, even if we don’t have all the solutions.”

(Suyin Haynes is a Senior Reporter with TIME Magazine.)