Their cities are running out of water. Droughts are driving their friends off their farms. Mosquitoes are showing up in places where they had never seen them. The future of the planet seems so uncertain that they confess to being afraid and anxious.

From Melbourne to La Paz, London to Cape Town, young people took part in an historic day of protests on Friday to goad world leaders into addressing what they call the climate crisis. Rallies were held in an estimated 150 countries and across the United States.

Who are these young protest organizers? What is driving them? What do they want?