Netflix documentary David Attenborough: A Life on Our Planet finds the legendary broadcaster and conservationist looking back at his long life, possibly because he’s looking ahead the end of life on Earth, something that would occur too soon if humanity doesn’t wise up, he asserts. It opens with scenes where we see some quick highlights of Attenborough’s career, including archival footage of him travelling the world. But Attenborough uses his lifetime as a point of emphasis for how drastically the world has changed in a scant nine decade – the global population has more than tripled, deforestation has increased at a frightful rate and the oceans are warming. He calls human actions “a blind assault” on the natural world that has affected its most fundamental components. The outlook is dire: Dead oceans, melted ice caps, unpredictable weather, global food crises, and uninhabitable land. By the year 2100, the world’s sixth mass extinction would be well underway. A Life on Our Planet is a logical extension of our planet, which shifted the tone of Attenborough’s narration. He no longer minced words about climate change in our planet, and its imagery, some of it recycled in this new film, is alarming.