Swedish 16-years-old climate activist Greta Thunberg (C) takes part in a march for the environment and the climate organised by students, in Brussels, on Februaru 21, 2019. - Greta Thunberg, the 16-year-old Swedish climate activist who has inspired pupils worldwide to boycott classes, urged the European Union on February 21, 2019 to double its ambition for greenhouse gas cuts. (Photo by EMMANUEL DUNAND / AFP)