(FILES) British broadcaster and conservationist David Attenborough gestures as he sits with Britain's Prime Minister Boris Johnson (unseen) during an event to launch the United Nations' Climate Change conference, COP26, in central London on February 4, 2020. 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 Chris J Ratcliffe / POOL / AFP via Getty Images)