The activists, who call themselves Extinction Rebellion, have erected two banners on London's Westminster Bridge. The first one reads "Climate Change", while the other one says "We're F*cked".
This comes two days after Extinction Rebellion members chained themselves together and super-glued themselves to the gates inside Britain's Energy Department, blocking the entrance to and exit from the building.
Extinction Rebellion claims on the group's webpage that the authorities "must tell the truth about the climate and wider ecological emergency" and "reverse" inconsistent environmental policies.