TOPSHOT - Swedish environment activist Greta Thunberg speaks at a climate protest outside the White House in Washington, DC on September 13, 2019. Thunberg, 16, has spurred teenagers and students around the world to strike from school every Friday under the rallying cry "Fridays for future" to call on adults to act now to save the planet. / AFP / Nicholas Kamm
Swedish environment activist Greta Thunberg speaks at a climate protest outside the White House in Washington, DC. AFP

Why has Greta Thunberg got so many people riled?