Southeast Asia has many active volcanoes. They have caused major eruptions, tsunamis, city damage, and climate effects, and millions of people live nearby.

Devastating mudflows flatten the Californian coastal community of Montecito; a sudden flash flood sweeps up an inexperienced kayaker in South Africa.

As the ocean's hunters prowl the seas, each masters its own way of survival. Their strategies differ, but the same rules apply: Assess, adapt, act.

Europe's Danube is ranked as one of the world's most endangered rivers. Jeremy goes in search of two beasts: a fish so valuable that criminals are hunting it out of existence and a man-sized predator.

To prepare for winter in the Arctic, the Alaskans must overcome challenges as they travel through unfamiliar territories. They must take advantage of the fall season by stockpiling resources.

However fascinating the reefs themselves may be, far more species depend on the environment they create outside. This occurs in Australia and its Indian Ocean waters in abundant number and variety.

Southeast Asia has many active volcanoes. They have caused major eruptions, tsunamis, city damage, and climate effects, and millions of people live nearby.

To prepare for winter in the Arctic, the Alaskans must overcome challenges as they travel through unfamiliar territories. They must take advantage of the fall season by stockpiling resources.

A bomb cyclone detonates across northeast America, snaring an elderly Michigan couple in a mass freeway pile-up. A hiker loses her nerve high on Ben Nevis.

Europe's Danube is ranked as one of the world's most endangered rivers. Jeremy goes in search of two beasts: a fish so valuable that criminals are hunting it out of existence and a man-sized predator.

To prepare for winter in the Arctic, the Alaskans must overcome challenges as they travel through unfamiliar territories. They must take advantage of the fall season by stockpiling resources.

However fascinating the reefs themselves may be, far more species depend on the environment they create outside. This occurs in Australia and its Indian Ocean waters in abundant number and variety.

As the ocean's hunters prowl the seas, each masters its own way of survival. Their strategies differ, but the same rules apply: Assess, adapt, act.

Europe's Danube is ranked as one of the world's most endangered rivers. Jeremy goes in search of two beasts: a fish so valuable that criminals are hunting it out of existence and a man-sized predator.

To ensure their survival for the upcoming winter, Alaskans must head out into the fray. From scouting for resources in sub-zero temperatures to hiking the countryside in search of food.

We take in New Zealand's natural beauty from Fiordland - the home of the Hobbits - to Cape Reinga, the northern tip where wild horses run along lonely sandy beaches.

The San Andreas Fault is the junction point of two tectonic plates stretching across San Francisco and Los Angeles; it is 1,300km long and currently the most surveyed phenomenon in the world.

To ensure their survival for the upcoming winter, Alaskans must head out into the fray. From scouting for resources in sub-zero temperatures to hiking the countryside in search of food.

A bomb cyclone detonates across northeast America, snaring an elderly Michigan couple in a mass freeway pile-up. A hiker loses her nerve high on Ben Nevis.

Europe's Danube is ranked as one of the world's most endangered rivers. Jeremy goes in search of two beasts: a fish so valuable that criminals are hunting it out of existence and a man-sized predator.