For more than seven decades, Sir David Attenborough has been both the face of natural history programming and a shrewd innovator who has broken boundaries to define modern broadcasting.
Attenborough, who turns 100 on Friday, first appeared on British TV screens in the 1950s as the host of wildlife show Zoo Quest, setting him on a career path that would make him one of the most feted television producers in the world.
His staying power has allowed him to uniquely show the passage of time and the impact of global warming on natural habitats, and the devastating effects it has had on species in every corner of the globe.
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