Participants pose for a group photo with a Panda mascot before the WWF's 22nd Annual CN Tower Climb event in Toronto, Canada, April 19, 2012. About 5,000 climbers were expected to show up to climb the 1,776 steps to the top of CN Tower, North America's tallest free-standing structure, and to raise over 1.3 million Canadian dollars to support WWF's ongoing conservation work in Canada. (Xinhua/Zou Zheng) |