WhatsApp chat rooms and Telegram channels across Germany lit up in the early hours of April 29. Young people frantically exchanged messages in a tone that went from disbelief to surprise to euphoria.

The country’s highest court had just ruled that the government’s 2019 climate law was incompatible with fundamental rights, a victory for the nine young German activists who filed the lawsuit and for the global youth climate movement. Over the next few days, it also changed the course of Germany’s politics, economy and climate strategy for the next three decades.

"For us it has been rather shocking. We were surprised because we did not have so many expectations of winning,” said Nick Heubeck, a 22-year-old student and a spokesperson for the Fridays For Future movement in Germany, one of the organizations supporting the suit. "Much of what has happened over the past few days would have been completely unthinkable before the ruling.”