When the original Planet Earth miniseries was co-produced and presented by Discovery Channel a decade ago, that network took the astoundingly infuriating, wrong-headed and insulting step of replacing the narration by Sir David Attenborough with newly recorded narration by Sigourney Weaver. Nothing about Sigourney Weaver (her father, after all, was one of TV’s first visionary programmers, NBC’s Sylvester “Pat” Weaver), but swapping out the best nature documentary host on the planet for an actress allegedly more “acceptable” to American ears is absurd. The good news is that the “original” 2006 Planet Earth, with Attenborough as narrator, still exists – and today, as a prelude to the U.S. premiere of Planet Earth II (also narrated by Attenborough, 10 years later), BBC America is repeating the entire 11-part Planet Earth all day, with Attenborough’s voice prominently and passionately attached. Watch, and listen. You’ll be astounded. And hit record, because you’ll want to savor every hour.