He said: "Of course, the incredible popularity of the series is the result of other factors as well. The proximity to the animals brought about by the latest technology gives us a new and engrossing perspective on the struggles many of them endure to survive.
"The scale and power of the landscape have never been more vivid - seen in extraordinary ultra-high definition."
"The 8pm Sunday evening slot is undoubtedly helpful, too. I'm told that we are attracting a larger than normal number of younger viewers (more 16- to 35-year- olds than The X Factor) and apparently the music of Hans Zimmer in particular is striking a chord with the young. And that pleases me enormously."
"It is our environmental legacy that the younger generation of today will inherit; we need them to become the environmental champions of the future. And that's why television of this type is so important."
"It isn't just delivering animals into our homes but transporting us into theirs. It's enabled us to see just how full of wonder those habitats are and underlines why we must protect them."
This year, promotion around Planet Earth II has certainly appeared to focus on younger people.
The Twitter account for the program frequently tweets pop culture references and memes as well as pictures and videos of adorable animals.