Photo Gallery: The Rebels' Yell 10/04/2019
 The helmet of an Extinction Rebellion activist at a climate strike event held...
Nilkas Grapatin / DER SPIEGEL

The helmet of an Extinction Rebellion activist at a climate strike event held in Hamburg on September 20. The decentralized group, which is fighting against climate change in at least 50 countries, is planning major demonstrations in Berlin on October 7.