BBC Earth (HD)

A flash flood in Australia leaves a family running scared. In Wisconsin, a woman and her dog risk getting swept under the ice and a tornado forces a man to take cover in Vancouver.

We follow Savannah and her four cubs in the Tswalu Kalahari Reserve.

Feast your eyes on structural marvels brought to life when engineers are forced to go underground.

Many passionate people are dedicated to saving the wild animals of Asia. These individuals and their ingenious solutions give us hope and optimism for the future of the continent.

The teams are starting from the third checkpoint in Phnom Penh, Cambodia, and must travel 1,400 kilometres through Thailand, one of the most visited countries in the world.

We follow Savannah and her four cubs in the Tswalu Kalahari Reserve.

Feast your eyes on structural marvels brought to life when engineers are forced to go underground.

Meet 87 year old Tim Slessor, the British adventurer plotting his last great adventure: recreating his epic 1955 expedition - 'First Overland: London to Singapore' - which a young David Attenborough commissioned for the BBC.

The teams are starting from the third checkpoint in Phnom Penh, Cambodia, and must travel 1,400 kilometres through Thailand, one of the most visited countries in the world.

Many passionate people are dedicated to saving the wild animals of Asia. These individuals and their ingenious solutions give us hope and optimism for the future of the continent.

Feast your eyes on structural marvels brought to life when engineers are forced to go underground.

Meet 87 year old Tim Slessor, the British adventurer plotting his last great adventure: recreating his epic 1955 expedition - 'First Overland: London to Singapore' - which a young David Attenborough commissioned for the BBC.

We follow Savannah and her four cubs in the Tswalu Kalahari Reserve.

The teams are starting from the third checkpoint in Phnom Penh, Cambodia, and must travel 1,400 kilometres through Thailand, one of the most visited countries in the world.

Many passionate people are dedicated to saving the wild animals of Asia. These individuals and their ingenious solutions give us hope and optimism for the future of the continent.

While in Costa Rica, Patrick investigates the declining population of insects and heads deep into the rainforest to find out just how far and wide this dramatic change is being felt.

In Namibia's extreme environment, Levison tracks down some of the last remaining desert lions and learns about the vital work that's giving them a fighting chance of survival.

Alaskans seek out vital resources amid a deep freeze in the heart of Dark Winter, pushing through temperatures well below zero.

Feast your eyes on structural marvels brought to life when engineers are forced to go underground.

Meet 87 year old Tim Slessor, the British adventurer plotting his last great adventure: recreating his epic 1955 expedition - 'First Overland: London to Singapore' - which a young David Attenborough commissioned for the BBC.

While in Costa Rica, Patrick investigates the declining population of insects and heads deep into the rainforest to find out just how far and wide this dramatic change is being felt.

In Namibia's extreme environment, Levison tracks down some of the last remaining desert lions and learns about the vital work that's giving them a fighting chance of survival.

We follow Savannah and her four cubs in the Tswalu Kalahari Reserve.

Feast your eyes on structural marvels brought to life when engineers are forced to go underground.

Meet 87 year old Tim Slessor, the British adventurer plotting his last great adventure: recreating his epic 1955 expedition - 'First Overland: London to Singapore' - which a young David Attenborough commissioned for the BBC.

In Namibia's extreme environment, Levison tracks down some of the last remaining desert lions and learns about the vital work that's giving them a fighting chance of survival.

Many passionate people are dedicated to saving the wild animals of Asia. These individuals and their ingenious solutions give us hope and optimism for the future of the continent.

While in Costa Rica, Patrick investigates the declining population of insects and heads deep into the rainforest to find out just how far and wide this dramatic change is being felt.

We follow Savannah and her four cubs in the Tswalu Kalahari Reserve.

Feast your eyes on structural marvels brought to life when engineers are forced to go underground.

The teams are starting from the third checkpoint in Phnom Penh, Cambodia, and must travel 1,400 kilometres through Thailand, one of the most visited countries in the world.

Many passionate people are dedicated to saving the wild animals of Asia. These individuals and their ingenious solutions give us hope and optimism for the future of the continent.

A flash flood in Australia leaves a family running scared. In Wisconsin, a woman and her dog risk getting swept under the ice and a tornado forces a man to take cover in Vancouver.

Feast your eyes on structural marvels brought to life when engineers are forced to go underground.

The teams are starting from the third checkpoint in Phnom Penh, Cambodia, and must travel 1,400 kilometres through Thailand, one of the most visited countries in the world.

While in Costa Rica, Patrick investigates the declining population of insects and heads deep into the rainforest to find out just how far and wide this dramatic change is being felt.

Many passionate people are dedicated to saving the wild animals of Asia. These individuals and their ingenious solutions give us hope and optimism for the future of the continent.

For primates, family is everything. Complex social lives are key to their success.

The teams are starting from the third checkpoint in Phnom Penh, Cambodia, and must travel 1,400 kilometres through Thailand, one of the most visited countries in the world.

In the shadows of Sellafield, the most hazardous industrial site in western Europe, Simon meets members of the Civil Nuclear Constabulary. He's also given rare access to Sellafield's aging facilities.

Renowned wildlife film-maker Gordon Buchanan gets close to wild cheetah.

The teams must navigate the full length of Thailand to reach the next checkpoint - Koh Phi Phi - an archipelago of islands immortalised by the Hollywood blockbuster movie The Beach.

Kate takes a trip down memory lane on a wintry walk around the western corner of the Isle of Wight, where she holidayed as a girl.

Simon joins an Aussie rancher to round up camels using a specially-adapted off road vehicle and a chopper.