Climate protesters in London

Climate change protesters hold a rally outside Shell petroleum's headquarters on Sept 1, 2009 in London, England. (Getty Images)

Climate campaigners have also been staging a week long protest camp in Blackheath south London. (Getty Images)

Climate change protesters hold a banner outside of the Shell petroleum's headquarters on Sept 1, 2009 in London, England. Climate campaigners have also been staging a week long protest camp in Blackheath south London. (Getty Images)

Police officers monitor climate change protesters outside of the Shell petroleum's headquarters on September 1, 2009 in London, England. (Getty Images)

Climate change protesters demonstrate on top of the porch to Shell petroleum's headquarters after removing the 'S' from the 'Shell Centre' sign on Sept 1, 2009 in London, England. (Getty Images)

Climate change protesters march through central London from British Petroleum headquarters to the Shell Centre on Sept 1, 2009 in London, England. (Getty Images)