Greta Thunberg had to be forcibly dragged away from a protest after five days.
The 21-year-old was sat protesting in front of the Swedish parliament building in Stockholm.
Thunberg and dozens of other environmental campaigners on Monday began blocking the main entrances to Sweden's parliament.
The group were holding a sit-down protest against the effects of climate change and what they said was political inaction.
Greta Thunberg had to be dragged away from the protest
Reuters
Police did not intervene at first, but removed the demonstrators when the protest resumed on Tuesday.
Stockholm police have said that although activists had the right to demonstrate outside the national assembly, they were removed for blocking entrances.
Thunberg said: "We are a group of young people who are blocking entrances to the Swedish Parliament, the Riksdag, to protest against the ongoing destruction of our life-supporting systems and of people already being killed as a result of the climate crisis.
"That needs to come to an end. We have had enough."
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The 21 year old had to be forced into a police van
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Thunberg, 21, became the face of young climate activists as her weekly protests, starting in 2018, in front of the Swedish parliament quickly grew into a global youth movement with large rallies across continents.
In February, Thunberg was arrested during a demonstration near the InterContinental Hotel in Mayfair, London on October 17 as oil executives met inside for a conference.
Thunberg and four others who were charged with public order offences over a protest in London were cleared after a judge ruled that they had no case to answer.
Raj Chada, a lawyer who represented Thunberg and two other defendants, said outside Westminster Magistrate's Court said: "The government should stop prosecuting peaceful protesters and instead find ways to tackle the climate crisis."
The protest was held outside the Swedish Parliament building in Stockholm
Reuters
A spokesperson for the Metropolitan Police said in a statement: "While we absolutely respect the right to protest, we often hear from Londoners who are fed up with repeated serious disruption at the hands of campaigners who block roads and prevent people going about their normal business.
"Officers have to balance these considerations in real-time...We will review the decision carefully."