Sorry to intrude on this riveting debate, but another show I really enjoyed recently was Stephen Fry filling in for the unavailable Douglas Adams on the 20-years-later followup to Adams' radio show & Book "Last Chance to See". While the BBC / Attenborough pairing are the definitive nature docos, this BBC production is as much about conservation efforts as it is the animals themselves. As you'd expect from an Adams / Fry pedegree, it is very well written and rather hilarious in parts. And if you've never seen the Charlie Boorman/ Ewan Macgregor "Long Way..." (Long Way Round, then Long Way Down) global motorcycle excursions, they're essential viewing. I know you didn't mention documentaries in your list, but I think you'd like the above shows. So there.