Greta Tintin Eleonora Ernman Thunberg (Swedish: [ˈɡrêːta ˈtʉ̂ːnbærj] (listen); born 3 January 2003) is a Swedish environmental activist who is known for challenging world leaders to take immediate action for climate change mitigation.
Thunberg's activism began when she persuaded her parents to adopt lifestyle choices that reduced their own carbon footprint. In August 2018, at age 15, she started spending her Fridays outside the Swedish Parliament to call for stronger action on climate change by holding up a sign reading Skolstrejk för klimatet (School Strike for Climate). Thunberg initially gained notice for her youth and her straightforward and blunt speaking manner, both in public and to political leaders and assemblies, in which she criticizes world leaders for their failure to take what she considers sufficient action to address the climate crisis.
Soon other students engaged in similar protests in their own communities. Together they organized a school climate strike movement under the name Fridays for Future. After Thunberg addressed the 2018 United Nations Climate Change Conference, student strikes took place every week somewhere in the world. In 2019, there were multiple coordinated multi-city protests involving over a million students each. To avoid carbon-intensive flying, Thunberg sailed in a yacht to North America, where she attended the 2019 UN Climate Action Summit. Her speech there, in which she exclaimed "How dare you?", was widely taken up by the press and incorporated into music. She speaks fluent English, and most of her public interactions are in English.

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