Greta Thunberg is part of the hundreds of activists who have sued Sweden over the climate crisis.
Over 600 people believe that the country is undertaking insufficient climate action and have marched through the Swedish capital, on their way to a court to file the legal claim.
Everyone who signed the 87-page document is under the age of 26, with youth-led initiative Aurora responsible for preparing and filing the claim.
Taking to Twitter, Thunberg wrote: "Today on Black Friday is the perfect day to sue the state over its insufficient climate policies. So that’s what we did.
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"See you in court!"
Anton Foley, spokesperson of Aurora, added: "Sweden has never treated the climate crisis like a crisis.
"Sweden is failing in its responsibility and breaking the law."
Fellow activist, Ida Edling, claims Sweden 'is pursuing a climate policy the research is very clear will contribute to a climate disaster in the future'.
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This follows Thunberg's recent lashing out at the West's so-called obsession with capitalism.
During a sit-down chat in London to promote her new book, the 19-year-old said the Western world is in need of a 'system-wide transformation'.
"We are never going back to normal again because ‘normal’ was already a crisis," the climate activist said.
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"What we refer to as normal is an extreme system built on the exploitation of people and the planet.
"It is a system defined by colonialism, imperialism, oppression and genocide by the so-called global North to accumulate wealth that still shapes our current world order."
Thunberg was speaking at London’s Royal Festival Hall to launch her new published work The Climate Book.
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"We are still here, and we are not planning on going anywhere," she added.
"Young people all over the world are stepping up, showing that our leaders messed with the wrong generation."
During a question and answer section of the event, Thunberg also said: "We need to change everything because right now our current system is on a collision course with the future of humanity and the future of our civilisation."
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The activist recently referred to the UN's climate conference COP27 as a 'colossal scam'.
"I’m not going to COP27 for many reasons, but the space for civil society this year is extremely limited," she said.
"The COPs are mainly used as an opportunity for leaders and people in power to get attention, using many different kinds of greenwashing."
She added: "As it is, the COPs are not really working, unless, of course, we use them as an opportunity to mobilise, which we must try to do, and make people realise what a colossal scam this is."
Topics: Climate Change, Greta Thunberg, Politics