BBC Earth

Weather controls the distribution of freshwater on Earth, which in turn shapes the lives of animals in diverse habitats around the globe.

While many of the new lives Ben dives into feel like a gritty struggle against the elements, Lucy and Tim's relocation to New Zealand looks more like something from an aspirational blog or YouTube channel.

As one of the world's most in-demand sporting coaches, 43-year-old Nikola Boric once travelled the world, welcomed everywhere he went. Now, he lives in a wooden cabin without electricity, water or heating.

Sue hears a noise in the night and searches for searches for possible predators. Meanwhile, Chip and Agnes hunt for caribou.

Michael Portillo travels east through the Balkans along the most exotic section of the Orient Express. His destination is Istanbul, a multi-ethnic city where Europe and Asia meet via an underground railway.

Michael Portillo travels the Habsburg imperial line from Vienna across the awe-inspiring Semmering Pass, a handmade railway line blasted through the Alps. His destination is the Adriatic port of Trieste.

In the footsteps of Livingstone and Stanley, Ben Fogle and Dwayne Fields try to solve one of history's greatest mysteries, setting out to find the Nile's source, travelling through deadly jungles and swamps.

The struggle for survival in Alaska continues for Sue, Jessie, Glenn and the Hailstones.

The struggle for survival in Alaska continues for Sue, Jessie, Glenn and the Hailstones.

The struggle for survival in Alaska continues for Sue, Jessie, Glenn and the Hailstones.

Dr. Mosley meets with eight Australians diagnosed with type 2 diabetes or pre-diabetes.

Of all our great inventions, the rocket is truly the one with the potential to change the entire species, allowing us to leave our Earthly home and become citizens of the universe. The origins of the rocket are surprising old.

From freshwater jungle ponds to the dark depths of the open ocean, air breathing mammals have found remarkable ways to overcome the many challenges of a life in water.

From ice-covered seas to snow-capped mountains, mammals have conquered the cold, living in the harshest places on earth, thanks to their remarkable intelligence and adaptations.

Simon Reeve embarks on the fourth and final leg of his journey around the Mediterranean, travelling from Morocco, across the sea to Spain, and on to Corsica and the French Riviera.

When mathematician and broadcaster Hannah Fry is diagnosed with cervical cancer she deals with it the only way she knows how; to make a documentary, combining raw and personal footage - and curiosity.

Xand Van Tulleken and Raksha Dave tell the dramatic story of tsunami which killed more than 250,000 people. They begin 12 hours before the disaster on Christmas Day 2004 when holiday makers across Asia enjoyed blissful breaks, unaware that a natural disaster was heading their way.

In the footsteps of Livingstone and Stanley, Ben Fogle and Dwayne Fields try to solve one of history's greatest mysteries, setting out to find the Nile's source, travelling through deadly jungles and swamps.

Ben meets Janey, a vet, who took it upon herself to rescue and nurse back to health hundreds of dogs in Sri Lanka.

From freshwater jungle ponds to the dark depths of the open ocean, air breathing mammals have found remarkable ways to overcome the many challenges of a life in water.

Spring is coming to Alaska and the break up of the Yukon river brings the threat of flooding, the challenge of reaching fresh water and a teaching opportunity for a man and his young children.