It wasn't said, but I believe the program was essentially "ripped-off" from the book. Very interesting stuff, but I thought, as a documentary, it was pretty slapdash and a bit cheesy-looking. But, yes, humbling it most certainly is. And I'm damned depressed having seen, in the last week, both that and several other shows about how the Earth is inevitably doomed by gamma ray bursts, robotic intelligence, mega-volcanos, asteroid impacts, and global warming.
Watch out for that robotic intelligence.