Emma Thompson joins giant polar bear at Greenpeace protest outside Shell HQ

Actor campaigns against the 'selfishness and greed' of Shell's bid for Arctic oil as part of a week-long demonstration in London

A bus-sized polar bear and Emma Thompson have joined a week-long protest against Arctic drilling at Shell's headquarters in London.

The British actor visited the Arctic last year and said that she had got out of bed at 4am on Wednesday to take part in the protest because of the risk of climate change to her grandchildren and the threat posed to the polar region's fragile environment by drilling.