Britain's Sir David Attenborough, for decades the world's most authoritative voice on the natural world and whose documentaries have been watched by hundreds of millions, celebrates his 100th birthday this week. After more than 70 years of film-making, Attenborough's instantly recognisable voice is synonymous with the story of nature. He is still at the vanguard of efforts to protect the environment and has produced some of his most impactful work in recent years. He becomes a centenarian on Friday. Counting Britain's Royal family, former US President Barack Obama and pop star Billie Eilish among his admirers, Attenborough's charisma, humour and warmth, alongside the depth of his knowledge and his flair for storytelling, have made him a broadcasting superstar. "Your ability to communicate the beauty and vulnerability of our natural environment remains unequalled," was how the late Queen Elizabeth II summed up his achievements in 2019.…