Sir David Attenborough turns 100 on May 8th, 2026, completing a journey that began when silent films were still competing with talkies and ends in an era of climate crisis livestreams. The man who started at the BBC (British Broadcasting Corporation) in 1952 as a trainee has outlasted entire empires of media, outlived most of the wildlife he first filmed, and witnessed more environmental collapse than any human in history. His career spans from black and white reels of zoo animals to 4K drone footage of melting ice sheets, from a world of 2.5 billion people to 8 billion today. The numbers around Attenborough's influence border on incomprehensible. His documentaries have been watched by an estimated 500 million people per series at their peak. "Planet Earth" alone reached over a billion viewers across its various iterations. He didn't just narrate nature, he created the grammar for how we experience it on screen: the slow motion cheetah hunt, the time lapse bloom, the god's eye aerial shot that makes continents look like organisms. Before Attenborough, nature documentaries were educational lectures. After him, they became event television that could out rate sports finals. But the achievement isn't just in ratings or longevity. Attenborough's real trick was making conservation feel urgent without making viewers feel lectured. For decades, he stuck to pure natural history, letting the beauty and brutality of wildlife speak for itself. Only in recent years, as evidence of ecological collapse became undeniable, did he pivot to explicit climate advocacy. His 2020 film "A Life on Our Planet" functioned as both memoir and warning, showing exactly how much planetary health has degraded within a single human lifetime. When a man who has seen more of Earth than perhaps anyone else alive tells you it's dying, people listen differently. The timing of this centenary carries weight. Attenborough turned 100 the same week that Antarctic sea ice hit another record low, the same month that coral bleaching reached levels unseen in modern records, and in a year when wildlife populations continue their documented decline. He has become both chronicler and witness to the sixth mass extinction, the only one in Earth's history caused by a single species. His archive of footage now serves as a baseline for what we've lost, a before photo for a planet that will never look the same again. What makes Attenborough's century particularly poignant is that he may be the last person who will ever experience Earth this biodiverse. Someone born now will inherit a planet with perhaps half the wildlife populations that existed when Attenborough started filming. The species he documented in the 1950s and 60s, many are simply gone. His work has inadvertently become a museum, not just entertainment. Future generations will watch his documentaries not to see nature as it is, but to see what it was, to glimpse a version of Earth their great grandchildren will never know existed.