Photo: Aurora, the Greenpeace polar bear, marches through London

Aurora, the three-tonne mechanical polar bear puppet, lumbers through downtown London, England on Sept. 15 in a Greenpeace march intended to draw attention to melting Arctic sea ice and the dangers of Arctic oil and gas exploration. Other events took place in 106 cities in 36 countries, Greenpeace says. (PHOTO COURTESY OF GREENPEACE)