article_snippet: In 2009, more than 20 Greenpeace activists managed to climb on to the roof of the Palace of Westminster to stage a protest .
article_snippet: the roof of the Palace of Westminster to stage a protest has been the scene of stunts by campaign groups in the past, including by protesters demonstrating against plans for a third runway at Heathrow Airport in 2008.
article_snippet: A year later more than 20 Greenpeace activists climbed on to the roof of the Palace of Westminster Westminster in a protest over climate change.
article_snippet: It was reported at the time that protesters managed to slide ladders through the railings surrounding the building and then use protesters to climb on to one of the lower roofs.
article_snippet: more than 20 Greenpeace activists also scaled the ramparts and a turret on top of Westminster Hall, unfurling yellow banners which read: 'Change the politics, save the climate.'