Greta Thunberg World's Savviest Twitter Troll
At 16 years old, Greta Thunberg has become the face of the youth climate movement.
On Wednesday, Time magazine named her its 2019 person of the year.
President Donald Trump criticized Time's choice as "ridiculous," tweeting that Thunberg has an "Anger Management problem" and needs to "Chill." Thunberg changed her Twitter bio to include Trump's insults.
Earlier in the week, Thunberg had a similar interaction with Brazilian President Jair Bolsonaro, who called the teenager a "little brat.