Students take part in the Global Climate Strike of the Fridays for Future movement in Berlin, Germany, September 20, 2019.Christian Mang | ReutersProtesters across the world came together on Friday to demand action on climate change. The global movement comes ahead of the United Nations Climate Action Summit, which is expected to begin Monday in New York.In August, the U.N.’s scientific panel on climate change released a report warning that unless humans change how they produce food and use land it will be impossible to keep global temperatures at a safe level.Here are pictures of protests across the globe.New YorkStudents protesting to demand action on climate change in New York City on Sept. 20th. 2019.Photo: Kerri HierlStudents activism in New York City. Kiev, UkrainePeople hold placards and shout slogans during a march called “For the climate in Ukraine” in the center of Kiev on September 20, 2019.Sergei Supinsky | AFP | Getty ImagesPeople shout slogans during a march called “For the climate in Ukraine” in the center of Kiev.TokyoParticipants hold signs and shout slogans during Global Climate Strike on September 20, 2019 in Tokyo, Japan. Students and adults joined together on Friday as part of a global mass day to demand action on climate change.Yuichi Yamazaki | Getty Images News | Getty ImagesAt the Global Climate Strike in Tokyo, students and adults came together with signs to demand action on climate change.Berlin & MunichA protester holds a globe-shaped sign reading “Save Me” during the “Fridays for Future” demonstration in Berlin during a protest for climate action on September 20, 2019, part of a global climate action day.David Gannon | AFP | Getty ImagesIn Berlin, a protester at the “Fridays for Future” demonstration held a globe-on-fire sign that read, “Save Me.”People gesture as they gather in front of the Brandenburg Gate to take part in the Global Climate Strike of the movement Fridays for Future, in Berlin, Germany, September 20, 2019.Fabrizio Bensch | ReutersIn front of the Brandenburg Gate in Berlin, protesters joined in on the movement.Dog Leni takes part in a demonstration and carries a poster with the inscription “Vegan for the Planet” in Munich, Germany.. The demonstrators follow the call of the movement Fridays for Future and want to fight for more climate protection.Sven Hoppe | picture alliance | Getty ImagesIn Munich, a dog joined the demonstration with a poster that read, “Vegan for the Planet.”Edinburgh, ScotlandCampaigners protest during a climate change action day on September 20, 2019 in Edinburgh, Scotland.Jeff J Mitchell | Getty ImagesThrongs of protestors in Edinburgh, Scotland, joined in on the Global Climate Strike.Melbourne, AustraliaAn Aboriginal man marching on September 20, 2019 in Melbourne, Australia.Asanka Ratnayake | Getty Images News | Getty ImagesAn Aboriginal man was among a crowd of demonstrators in Melbourne, Australia.AmsterdamSchool students and protesters gather during a climate strike rally at the Dam Square on September 20, 2019 in Amsterdam, Netherlands.Paulo Amorim | NurPhoto | Getty ImagesProtesters, including school students, gathered at the Dam Square in Amsterdam during a climate strike rally.JohannesburgProtesters march during a rally against climate change as part of a Global Climate action day in Johannesburg on September 20, 2019.Michele Spatari | AFP | Getty ImagesIn South Africa, protesters participated in the day of global action at a rally.Kolkata, India & New Delhi, IndiaAn activist takes part in a Global Climate Strike rally in Kolkata, India, September 20, 2019.Rupak De Chowdhuri | ReutersActivists in Kolkata, India, took part in a Global Climate Strike rally.Students and activists hold placards with messages as they participate in a Global Climate Strike rally in New Delhi, India, September 20, 2019.Anushree Fadnavis | ReutersMiles away, activists in New Delhi joined in.StockholmYoung activists attend the Fridays for Future global climate strike in Stockholm, Sweden, September 20, 2019.Stina Stjernkvist | TT News Agency | ReutersIn Stockholm, activists marched down a street holding signs as part of the Fridays for Future Global Climate Strike.Lodz, PolandYoung activists take part in an environmental demonstration, part of the Global Climate Strike, in Lodz, Poland September 20, 2019.Tomasz Stanczak | Agencja Gazeta | ReutersYoung activists in Lodz, Poland, took part in the environmental demonstration.Abuja, NigeriaEnvironmental groups call for global climate strike action during a rally in Abuja, Nigeria September 20, 2019.Afolabi Sotunde | ReutersEnvironmental groups in Abuja, Nigeria, called for global climate action.IstanbulStudents hold placards as they take part in the Global Climate Strike of the Fridays for Future movement in Istanbul, Turkey, September 20, 2019.Murad Sezer | ReutersStudents in Istanbul held signs during the Global Climate Strike of the Fridays for Future movement.ViennaProtestors march as part of the Global Climate Strike of the movement Fridays for Future in Vienna, Austria, September 20, 2019.Lisi Niesner | ReutersYoung protesters in Vienna took part in the global action.BrusselsThousands of environmentalist gather during a demonstration to draw attention to global warming and climate change in Brussels, Belgium on September 20, 2019.Dursun Aydemir | Anadolu Agency | Getty ImagesThousands of protestors gathered in the capital of Belgium to draw attention to climate change.Dhaka, BangladeshStudents and protesters gather to attend a climate strike rally in Dhaka, Bangladesh on September 20, 2019.Zakir Hossain Chowdhury | Barcroft Media | Getty ImagesStudents and protesters rallied in Dhaka, Bangladesh.