BBC Earth

Halfway through their trek, Lucy and the team face dense forests and the ever-present threat of elephants, as rations run dangerously low.

Ash and his team battle rapids, dense jungle and wildlife to uncover the hidden source of the Coppename River.

On the famous Ho Chi Minh Trail, Guy visits a Huey helicopter graveyard, makes his own version of napalm and comes face to face with a live cluster bomb left over from the war.

The second leg of Simon's journey takes him from the beautiful fjords of Norway across the North Atlantic to Iceland, the original land fire and ice. It's a world of extremes and contradictions.

Skip the runway with a 747 made over into a classy hotel, then inspect a malthouse that has been remodelled into a concert hall filled with beautiful music.

In California, it's a vacation from hell as hundreds of campers flee a rampaging wildfire. And in the Czech Republic a rare tornado crashes through.

Simon Reeve treks and canoes through Canada's rugged and frozen Yukon Territory, to meet the people who make the wilderness home, and search for grizzly bears, the apex predator.

On the famous Ho Chi Minh Trail, Guy visits a Huey helicopter graveyard, makes his own version of napalm and comes face to face with a live cluster bomb left over from the war.

Skip the runway with a 747 made over into a classy hotel, then inspect a malthouse that has been remodelled into a concert hall filled with beautiful music.

Halfway through their trek, Lucy and the team face dense forests and the ever-present threat of elephants, as rations run dangerously low.

In California, it's a vacation from hell as hundreds of campers flee a rampaging wildfire. And in the Czech Republic a rare tornado crashes through.

In this final episode we meet the scientists dedicating their lives to understanding what these changes mean, not just for animals and people who live there, but for the planet as a whole.

New worlds and animal behaviours are uncovered on a journey from the equator to the poles.

A ground-breaking journey to The Deep, our final frontier and home to real-life aliens, from monstrous sharks to shrimps in glass cages and perhaps the origin of all life on Earth.

Corals build themselves homes of limestone in the warm, clear, shallow seas of the tropics.

The big blue is the world's greatest wilderness, far from shore and many kilometres deep. It's a vast marine desert where there is little to eat and nowhere to hide.

It's our green seas, not the blue, that bring life to our oceans. Here sunlight powers the growth of enchanted forests of kelp, mangroves and prairies of sea grass.

On the coast, two worlds collide. Coasts are the most dynamic and challenging habitats in the ocean - that brings great rewards but also great danger.

Uncover the impact that our modern lives are having on our best-loved characters from across the series.

On the famous Ho Chi Minh Trail, Guy visits a Huey helicopter graveyard, makes his own version of napalm and comes face to face with a live cluster bomb left over from the war.