Climate activist Greta Thunberg detained by police in London: Witness

Climate activist Greta Thunberg was detained by police in London on Tuesday, a Reuters witness reported, after she and others protested outside an oil and gas conference, preventing some delegates from attending. Thunberg, who became the face of young climate activists worldwide after staging weekly protests in front of the Swedish parliament in 2018, has this year been detained by police or removed from protests in Sweden, Norway and Germany.