In Antwerp, Belgium, thousands of students walked out of classes Thursday in a school strike demanding political action to combat catastrophic climate change. Similar protests have swept cities across Europe and around the world in recent weeks. The strikes were begun by 16-year-old Swedish climate activist Greta Thunberg, who addressed the Antwerp crowd on Thursday.

Greta Thunberg: “For way too long, the politicians and the people in power have gotten away with not doing anything to fight the climate crisis. And we will make sure that they will not get away with it anymore. We are striking because we have done our homework and they have not.”

Click here to see our full hour with Greta Thunberg, when we met her at the U.N. climate summit in Poland.