Greta Thunberg
Her story
One day in late August 2018, Greta Thunberg took up position outside Sweden's Parliament for the first time. She held a simple sign, black letters on a white board, that said "School Strike for Climate."
After she was pictured outside the Swedish parliament building with her sign, the teenager's protests went viral on social media.
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As support for her cause grew, other strikes started around the world, and the message spread with the hashtag #FridaysForFuture. By December 2018, more than 20,000 students around the world had joined her in countries including Australia, the UK, Belgium, the US and Japan.
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In September 2019 During her address at the UN, she blasted politicians for relying on young people for answers to climate change.
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"How dare you," she said. "I shouldn't be up here. I should be back in school on the other side of the ocean, yet you all come to us young people for hope. How dare you?
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"You have stolen my dreams and my childhood with your empty words. We will be watching you."
At the end of 2019, she was named Time Magazine's Person of the Year.