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A demonstrator carries a placard reading 'Je suis Planet Earth' (I am Planet Earth) during The People's Climate march in central London on March 7, 2015. Around 5,000 protesters marched on the British parliament Saturday demanding greater action on climate change, exactly two months ahead of the general election. The march was led by a man with green leaves attached to his head, who was riding a bicycle with large wings bearing the slogan: 'Look after your mum.' AFP PHOTO / NIKLAS HALLE'N (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)

A demonstrator carries a placard reading 'Je suis Planet Earth' (I am Planet Earth) during The People's Climate march in central London on March 7, 2015. Around 5,000 protesters marched on the British parliament Saturday demanding greater action on climate change, exactly two months ahead of the general election. The march was led by a man with green leaves attached to his head, who was riding a bicycle with large wings bearing the slogan: 'Look after your mum.' AFP PHOTO / NIKLAS HALLE'N        (Photo credit should read NIKLAS HALLE'N/AFP/Getty Images)