(FILES) Britain's Prince William, Duke of Cambridge (L) and British broadcaster and biologist David Attenborough attend a conversation during the World Economic Forum (WEF) annual meeting, on January 22, 2019 in Davos, eastern Switzerland. 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 Fabrice COFFRINI / AFP via Getty Images)