After six incredible episodes, the BBC's Planet Earth II ended on Sunday with the first and only on-camera appearance of the 90-year-old legend Sir David Attenborough.

Attenborough's much-loved voice narrated the entire season, but it wasn't until the last few minutes of the final episode that he took to the screen to make a final, emotional plea to viewers: please don't lose your connection with the natural world.

"Only a small number of animals have managed to find ways of living alongside us," said Attenborough from the top of the Shard skyscraper in London.

"And every 10 years an area the size of Britain disappears under a jungle of concrete. But it doesn’t have to be like this. Could it not be possible to build cities more in harmony with nature?"

"Now over half of us live in an urban environment. My home too is here in the city of London," he continued.

"Looking down on this great metropolis, the ingenuity with which we continue to reshape the surface of our planet is very striking. But it's also sobering. It reminds me of just how easy it is for us to lose our connection with the natural world."

"Yet it’s on this connection that the future of both humanity and the natural world depend," said Attenborough. "It’s surely our responsibility to do everything within our power to create a planet that provides a home not just for us, but for all life on Earth."

We're definitely not crying right now, that's just something in our eyes.

This season of Planet Earth II was watched by more young people in the 16 to 35 age group than rival timeslot program The X Factor, indicating just how desperate we all are to see the incredible things happening in the natural world.

Fittingly, the show's last episode looked at the impact that cities have on animal life - including a brutal scene where newly-hatched hawksbill turtles walked onto a busy road instead of into the sea, because they were thought street lights were the Moon.

It was pretty distressing stuff, but the BBC Earth Twitter account has since reassured the world that none of the baby turtles actually died, and the crew collected them and returned them to the sea after the cameras stopped rolling.

Every turtle that was seen or filmed by the #PlanetEarth2 crew was collected and put back into the sea. — BBC Earth (@BBCEarth) December 11, 2016

There's no doubt that the show left a big impact not just on us science lovers, but TV in general. In addition to being one of the most popular shows with young people, Planet Earth II is also currently the top-rated TV show on IMDB, and the BBC is contemplating a third season.

Hopefully we won't have to wait another 10 years for that, with the original Planet Earth series screening way back in 2006. Although we fully appreciate just how much time and effort it takes for film crews to capture the incredible moments in the show.

117 filming trips. 40 countries. 3 years in the making. Tonight, the final episode. #PlanetEarth2. 8pm. pic.twitter.com/wIpdp6EXPR — BBC One (@BBCOne) December 11, 2016

We're sad to see this latest season end, but to ease the pain, here's the glorious trailer once more.

Reminder: there are still beautiful and good things left in the world, and we need to protect them.