Greta Thunberg was detained by German police on Tuesday during a protest against the expansion of a coal mine in western Germany. According to reports, Thunberg was participating in a sit-in near the edge of the mine when she and other activists were detained. The mine is one of three massive open-pit coal mines in the German state of North Rhine-Westphalia and is responsible for about 20% of Germany's carbon emissions. The protesters are calling for the mine to be closed earlier than planned in order to reduce the country's carbon emissions.

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Greta Thunberg is a Swedish environmental activist who gained international recognition for her efforts to combat climate change. She began protesting outside of the Swedish parliament in August 2018, at the age of 15. Thunberg's protests inspired students around the world to participate in similar demonstrations, leading to the creation of the global climate strike movement Fridays for Future.

She has addressed world leaders at the United Nations Climate Action Summit, the World Economic Forum, and the COP24 climate conference. Thunberg was named Time magazine's Person of the Year in 2019. She has been nominated for a Nobel Peace Prize.

She has been diagnosed with Asperger syndrome, obsessive–compulsive disorder (OCD), and selective mutism.

Thunberg is vegan and an advocate for animal rights. She has been criticized by some politicians and media figures, who have questioned her message and tactics. Thunberg has also received support from many other politicians and activists and has been praised for her leadership and commitment to addressing climate change.