On the Ides of March (March 15), the day by which ancient Romans were expected to settle their debts, young people in 60 countries around the world will stage a school walkout to press world leaders for more urgent action on climate change. It is a tragedy that younger generations are forced to speak out against the injustice they will suffer as a result of choices made by others; yet, at the same time, it is deeply reassuring to witness their power and passion as they try to change the course of history. By Éloi Laurent