Greenpeace scales British Houses of Parliament

A flag flaps in front of Big Ben after Greenpeace demonstrators scaled the roof of the Houses of Parliament to protest against perceived government inaction on climate change, on October 11, 2009 in London. At least 40 activists occupied the roof of the famous Palace of Westminster in central London, unfurling several yellow banners reading: "Change the politics, save the climate". (AFP Photo)

A banner is hung from Parliament behind a statue of Oliver Cromwell after Greenpeace demonstrators scaled the roof of the Houses of Parliament to protest against perceived government inaction on climate change, on October 11, 2009 in London.  (AFP Photo)

A Greenpeace demonstrator climbs down the roof of the Houses of Parliament after taking part in a protest against perceived government inaction on climate change, on October 11, 2009 in London. The activists are vowing to stay on the roof overnight so they can welcome politicians back to Westminster the next morning. (AFP Photo)

Greenpeace demonstrators sit on the roof of the Houses of Parliament to protest against perceived government inaction on climate change, on October 11, 2009 in London. The protestors are calling for a new style of politics in Britain, one capable of rising to meet the challenge of climate change. (AFP Photo)

Forty activists occupied the roof of the famous Palace of Westminster in central London, displaying banners reading : "Change the politics, save the climate".  (AFP Photo)

A Greenpeace activist holds a "Save the Climate" flag in front of the Big Ben after demonstrators scaled the roof of the Houses of Parliament to protest against perceived government inaction on climate change, on October 11, 2009 in London. (AFP Photo)

Greenpeace volunteers' protests on climate change have virtually hit the roof with activists scaling the walls of the British Houses of Parliament and occupying the roof of the historic building.

Brikesh Singh, an Indian professor and a campaigner from Greenpeace India, is among those staging a sit-in. (AFP Photo)