(FILES) British broadcaster and biologist David Attenborough speaks during an interview at an event to celebrate the Scott Antarctic Expedition Centenary with the launch of 'Edward Wilson's Antarctic notebooks' in London on November 17, 2011. AFP PHOTO / ADRIAN DENNIS. David Attenborough, a leading voice on climate change and biodiversity loss, whose landmark documentaries transformed popular understanding of the natural world for a global audience, is set to mark his 100th birthday on May 8th. (Photo by Adrian DENNIS / AFP via Getty Images)