Gordon Buchanan joins Dr. Victor Lukarevsky in Russia to attempt to rehabilitate two pairs of lynx held captive for years.

Humans are changing our planet so rapidly, it's affecting earth's life support systems: our weather, our oceans and the living world.

In some natural wonders people push themselves to the limit, and survival requires skill, ingenuity and bravery.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

Professor Brian Cox grapples with science's darker side, asking why it often gets such a bad press; Brian wonders if science can go too far.

An epic journey into the unknown, a realm that feels almost like science fiction.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

Hope scrambles to save the animals when a burglar busts down the door to the rehab, as the spring baby boom brings in a flood of injured and orphaned animals.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

Scientists explore whether Earth's estranged twin Venus could be a vision of our planet's future.

Hope scrambles to save the animals when a burglar busts down the door to the rehab, as the spring baby boom brings in a flood of injured and orphaned animals.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

Scientists explore whether Earth's estranged twin Venus could be a vision of our planet's future.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

A Spinosaurus, the world's largest ever predatory dinosaur, struggles to bring up his babies and lead his young family across one of the deadliest environments on Earth.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

The story of Lusotitan, a colossal, long-necked dinosaur, and its quest for love.

Alaskans scramble to secure their livelihoods as the freeze begins; Sue Aikens returns to Kavik find a dangerous predator lurking just outside of camp.

The story of Lusotitan, a colossal, long-necked dinosaur, and its quest for love.

At the onset of winter, Alaskans combat threats; a storm batters Kavik as Sue fortifies camp; Ricko searches for elusive wildlife; the Hailstones ice fish; Johnny secures food in the Brooks Range.

It's officially the third-highest snowfall in Manitoba in the last century; commercial fishers are plagued by deep drifts and hidden pockets of slush that can stop them in their tracks; Chris finds out the hard way that traveling alone is a bad idea.

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

At the onset of winter, Alaskans combat threats; a storm batters Kavik as Sue fortifies camp; Ricko searches for elusive wildlife; the Hailstones ice fish; Johnny secures food in the Brooks Range.

It's officially the third-highest snowfall in Manitoba in the last century; commercial fishers are plagued by deep drifts and hidden pockets of slush that can stop them in their tracks; Chris finds out the hard way that traveling alone is a bad idea.

Levison Wood sets out to walk the length of the River Nile from source to sea; his nine-month, seven-million-step journey takes him through jungles, savannah, deserts, cities and war zones in some of Africa's most remote and spectacular locations.

Alaskans scramble to secure their livelihoods as the freeze begins; Sue Aikens returns to Kavik find a dangerous predator lurking just outside of camp.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

It's officially the third-highest snowfall in Manitoba in the last century; commercial fishers are plagued by deep drifts and hidden pockets of slush that can stop them in their tracks; Chris finds out the hard way that traveling alone is a bad idea.

Alaskans scramble to secure their livelihoods as the freeze begins; Sue Aikens returns to Kavik find a dangerous predator lurking just outside of camp.

Hope fights to save a family of foxes; the nursery is hit by a mysterious outbreak.

An enormous fiery vortex in Redding, Calif.; the island nation of Malta loses a natural treasure; a mysterious radioactive hotspot is discovered near Chernobyl; an unknown force lays waste to a mountain forest in Italian Alps.

Some of the world's greatest scientists devise scenarios for destroying Earth.

Hope fights to save a family of foxes; the nursery is hit by a mysterious outbreak.

An enormous fiery vortex in Redding, Calif.; the island nation of Malta loses a natural treasure; a mysterious radioactive hotspot is discovered near Chernobyl; an unknown force lays waste to a mountain forest in Italian Alps.

Some of the world's greatest scientists devise scenarios for destroying Earth.

Asia has the longest coastline of any continent, rich coral reefs, and never-seen-before animal behavior; exploring Asia's diverse waters.

Asia is the most mountainous continent on earth; from the tropical south to its barren centre, its highest places are home to some of our planet's most remarkable wildlife.

In the remote reaches of Asia's frozen north, creatures must overcome unique challenges, finding exceptional ways to thrive in a hostile world that pushes life to its very limits.

Asia has the longest coastline of any continent, rich coral reefs, and never-seen-before animal behavior; exploring Asia's diverse waters.

Asia is the most mountainous continent on earth; from the tropical south to its barren centre, its highest places are home to some of our planet's most remarkable wildlife.

In the remote reaches of Asia's frozen north, creatures must overcome unique challenges, finding exceptional ways to thrive in a hostile world that pushes life to its very limits.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Coral Reefs are vibrant undersea cities where life has found ways to survive.

From space, satellite cameras reveal that Earth is a kaleidoscope of color; turquoise plankton blooms trigger a feeding frenzy, China turns yellow with rapeseed flowers, and mysterious green lights appear in the ocean.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

Tutankhamun's tomb was discovered in November 1922; since then, scientists and archaeologists have been puzzled by an iron dagger that was tucked in among the linen folds of the mummy.

From space, satellite cameras reveal that Earth is a kaleidoscope of color; turquoise plankton blooms trigger a feeding frenzy, China turns yellow with rapeseed flowers, and mysterious green lights appear in the ocean.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

Tutankhamun's tomb was discovered in November 1922; since then, scientists and archaeologists have been puzzled by an iron dagger that was tucked in among the linen folds of the mummy.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Discovering how the moon shapes life on Earth.

Coral Reefs are vibrant undersea cities where life has found ways to survive.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

Scientists explore how to protect the earth when solar storms destroy earthbound technologies and send satellites crashing to earth.

Learning why an important urban center is sinking toward oblivion; soaring over sprawling ruins buried under Saharan sands; learning the modern secret of an ancient fortress; eyeing a ghost town on the edge of the Gobi.

Bill Nighy leads a magical journey in the Norfolk Broads along England's holiday river, the River Bure; discovering a watery world where both wildlife and recreation go hand in hand.

The diamond's rise from gemstone to a cutting-edge material that is set to revolutionize electronics.

Witness animal spectacles from high above the Earth; watch a whirling herd of northern nomads; see undersea behemoths show off in the Pacific shallows; track a U.S. porcine stampede; confront top ocean predators on the Florida coast.

Wandering in the spaces between and beyond the planets, where countless worlds exist without any light at all; peeking inside hidden realms that stretch halfway to the nearest star and find out what lies outside the reaches of the most powerful telescopes.

Professor Brian Cox explores the solar system's frozen worlds; he meets the dwarf planet where mountains of solid ice float across the surface, the black and white moon painted with frost and a world illuminated by a strange form of ice.

Brian journeys across the solar system and explores its weirdest worlds, the misfits and oddballs; he discovers the forces that sculpted bizarre features and strange phenomena.

Wandering in the spaces between and beyond the planets, where countless worlds exist without any light at all; peeking inside hidden realms that stretch halfway to the nearest star and find out what lies outside the reaches of the most powerful telescopes.

Professor Brian Cox explores the solar system's frozen worlds; he meets the dwarf planet where mountains of solid ice float across the surface, the black and white moon painted with frost and a world illuminated by a strange form of ice.

Brian journeys across the solar system and explores its weirdest worlds, the misfits and oddballs; he discovers the forces that sculpted bizarre features and strange phenomena.

Innovative efforts to confront climate change in Australia, Brazil, California and Kenya; with Dr. M. Sanjayan.

At the onset of winter, Alaskans combat threats; a storm batters Kavik as Sue fortifies camp; Ricko searches for elusive wildlife; the Hailstones ice fish; Johnny secures food in the Brooks Range.

Trekking across the planet's most hostile frozen zone: Antarctica; getting to know ice.

The same 92 elements that exist on Earth can be found throughout the cosmos.

Naturalist and explorer Steve Backshall takes on four new adventures to remote parts of the planet, including Saudi Arabia, Gabon and Mexico.

Scientists explore how to protect the earth when solar storms destroy earthbound technologies and send satellites crashing to earth.

Hope scrambles to save the animals when a burglar busts down the door to the rehab, as the spring baby boom brings in a flood of injured and orphaned animals.

An enormous fiery vortex in Redding, Calif.; the island nation of Malta loses a natural treasure; a mysterious radioactive hotspot is discovered near Chernobyl; an unknown force lays waste to a mountain forest in Italian Alps.

Trekking across the planet's most hostile frozen zone: Antarctica; getting to know ice.

From space, satellite cameras reveal that Earth is a kaleidoscope of color; turquoise plankton blooms trigger a feeding frenzy, China turns yellow with rapeseed flowers, and mysterious green lights appear in the ocean.

Professor Brian Cox ends his homage to science by revealing what science is and how it is always linked to the past.

Tutankhamun's tomb was discovered in November 1922; since then, scientists and archaeologists have been puzzled by an iron dagger that was tucked in among the linen folds of the mummy.

Traveling the Dordogne River via traditional boats through the green heart of southwest France; drinking wine and hunting for truffles; riding a luxury cruiser to a lighthouse built for a king.

The sudden release of built-up magnetic energy in the solar atmosphere - a solar storm - affects Earth.

Get petrified by cryptic rock structures normally hidden from view; look inside curious dwellings in the Peruvian Andes; visit a sacred monolith in Wyoming's Black Hills; haunt a Turkish stone village; spot an immovable waterfall in Mexico.

Traveling the Dordogne River via traditional boats through the green heart of southwest France; drinking wine and hunting for truffles; riding a luxury cruiser to a lighthouse built for a king.

Scientists explore whether Earth's estranged twin Venus could be a vision of our planet's future.

Strange aquatic mammals populating a river in Columbia; a ship marooned in a sea of sand along Namibia's notorious Skeleton Coast; a Boeing 727 jetliner hidden in a pine forest; an unusual pattern is discovered in the Nevada desert.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

A Spinosaurus, the world's largest ever predatory dinosaur, struggles to bring up his babies and lead his young family across one of the deadliest environments on Earth.

Persued by a group of Utahraptors, a gang of armored dinosaurs battle to reach adulthood.

A young Albertosaurus, a relative of Tyrannosaurus rex, must earn her place in a deadly hunting pack or face starvation.

The dangerous journey of the Pachyrhinosaurus, where survival is at stake during the annual migration hundreds of miles north.

The story of Lusotitan, a colossal, long-necked dinosaur, and its quest for love.

A race to find the planet's 60 deadliest creatures.

Steve takes a special journey to meet pangolins, the most trafficked animals on the planet, and the people who work tirelessly to save them.

Gordon Buchanan joins Dr. Victor Lukarevsky in Russia to attempt to rehabilitate two pairs of lynx held captive for years.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

Professor Brian Cox journeys to the remotest part of the solar system where the mysteries of Saturn, Uranus and Neptune remain in the shadows.

Humans are changing our planet so rapidly, it's affecting earth's life support systems: our weather, our oceans and the living world.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

Professor Brian Cox journeys to the remotest part of the solar system where the mysteries of Saturn, Uranus and Neptune remain in the shadows.

Humans are changing our planet so rapidly, it's affecting earth's life support systems: our weather, our oceans and the living world.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

As winter nears, Alaskans' preparations for the freeze begin to fall apart; the Hailstones fear they may have missed their chance to hunt caribou and stockpile meat for the winter.

Alaskans scramble to secure their livelihoods as the freeze begins; Sue Aikens returns to Kavik find a dangerous predator lurking just outside of camp.

Alaskans need to adapt and shift their plans due to unpredictable winter weather.

Twin fawns arrive at the centre; a volunteer searches for orphans in the woods; Hope tends to a tiny owl.

A long-forgotten network of Native American earthworks; a baffling battlefield mystery in Belgium; a mysterious blood red lake on a remote Greek island; an eerie pink glow emulating form the middle of the Pacific Ocean.

The history of the formation of the world's largest freshwater lake system reveals many mysteries surrounding the geological phenomenon.

Twin fawns arrive at the centre; a volunteer searches for orphans in the woods; Hope tends to a tiny owl.

A long-forgotten network of Native American earthworks; a baffling battlefield mystery in Belgium; a mysterious blood red lake on a remote Greek island; an eerie pink glow emulating form the middle of the Pacific Ocean.

A series of violent and dramatic processes leads to the development of the universe, eventually leading to the existence of man.

Twin fawns arrive at the centre; a volunteer searches for orphans in the woods; Hope tends to a tiny owl.

Alaskans struggle to get through the everyday grind as a long, dark winter looms ahead.

Brian explores the sun's rule over every world in the solar system.

In the heart of Asia lie vast arid lands; these deserts and dry grasslands are so hostile, they push life to the limit; the animals that live here are some of the toughest on earth - they are Asia's great survivors.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

Naturalist and explorer Steve Backshall takes on four new adventures to remote parts of the planet, including Saudi Arabia, Gabon and Mexico.

Alaskans struggle to get through the everyday grind as a long, dark winter looms ahead.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

Zac and Darin get down and dirty as they explore a natural approach to farming through regenerative agriculture and organic food production.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

After seven months walking, Lev reaches his final country: Egypt; he has 900 miles to go to the Mediterranean but the authorities give him just 45 days to finish.

Zac and Darin get down and dirty as they explore a natural approach to farming through regenerative agriculture and organic food production.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

After seven months walking, Lev reaches his final country: Egypt; he has 900 miles to go to the Mediterranean but the authorities give him just 45 days to finish.

Alaskans struggle to get through the everyday grind as a long, dark winter looms ahead.

Brian explores the sun's rule over every world in the solar system.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

Alaskans struggle to get through the everyday grind as a long, dark winter looms ahead.

Lynn plays surrogate to baby beavers; Zach is forced to follow a seal along the coastline; a patient returns after a release goes wrong.

Dive into the historical and natural secrets of the deep; explore an uninhabited concrete island, ocean spirals off the Australian coast, underwater evidence of a violent past and tracks thousands of metres below the sea's surface.

A series of violent and dramatic processes leads to the development of the universe, eventually leading to the existence of man.

Lynn plays surrogate to baby beavers; Zach is forced to follow a seal along the coastline; a patient returns after a release goes wrong.

Dive into the historical and natural secrets of the deep; explore an uninhabited concrete island, ocean spirals off the Australian coast, underwater evidence of a violent past and tracks thousands of metres below the sea's surface.

A series of violent and dramatic processes leads to the development of the universe, eventually leading to the existence of man.

Lynn plays surrogate to baby beavers; Zach is forced to follow a seal along the coastline; a patient returns after a release goes wrong.

The looming winter forces Alaskans to tackle obstacles to ensure a prosperous winter.

How Earth's cosmic backyard emerged from chaotic clouds of gas; two extraordinary wonders on Earth.

Zac and Darin get down and dirty as they explore a natural approach to farming through regenerative agriculture and organic food production.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

After seven months walking, Lev reaches his final country: Egypt; he has 900 miles to go to the Mediterranean but the authorities give him just 45 days to finish.

The looming winter forces Alaskans to tackle obstacles to ensure a prosperous winter.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

A race to find the planet's 60 deadliest creatures.

A race to find the planet's 60 deadliest creatures.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

A race to find the planet's 60 deadliest creatures.

A race to find the planet's 60 deadliest creatures.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

The looming winter forces Alaskans to tackle obstacles to ensure a prosperous winter.

How Earth's cosmic backyard emerged from chaotic clouds of gas; two extraordinary wonders on Earth.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

The looming winter forces Alaskans to tackle obstacles to ensure a prosperous winter.

Jennie and Stephanie try to save a harbour seal pup.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

The differences between the Northern and Southern Rockies.

Jennie and Stephanie try to save a harbour seal pup.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

The differences between the Northern and Southern Rockies.

Jennie and Stephanie try to save a harbour seal pup.

Alaskans must travel far and wide to obtain resources vital for survival in the dead of winter.

Brian reveals how the atmosphere can create most of the wonderful sights in the solar system.

A race to find the planet's 60 deadliest creatures.

A race to find the planet's 60 deadliest creatures.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.

Alaskans must travel far and wide to obtain resources vital for survival in the dead of winter.

Coasts are the most changeable habitats of the ocean world.

Gordon Buchanan returns to Russia to help Dr. Victor Lukarevsky prepare rehabilitated lynx for release back in the wild.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

Borneo is the richest rainforest island of all; home to 40,000 species of plants and animals, 6,000 of them are unique, and more are discovered almost daily.

Gordon Buchanan returns to Russia to help Dr. Victor Lukarevsky prepare rehabilitated lynx for release back in the wild.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

Borneo is the richest rainforest island of all; home to 40,000 species of plants and animals, 6,000 of them are unique, and more are discovered almost daily.

Alaskans must travel far and wide to obtain resources vital for survival in the dead of winter.

Brian reveals how the atmosphere can create most of the wonderful sights in the solar system.

Coasts are the most changeable habitats of the ocean world.

Alaskans must travel far and wide to obtain resources vital for survival in the dead of winter.

When a fawn is found stuck in thick, toxic tar, Hope assembles her entire team to wash and care for it in a desperate bid to save its life.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

Scientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.

When a fawn is found stuck in thick, toxic tar, Hope assembles her entire team to wash and care for it in a desperate bid to save its life.

Exploring some of the most cavernous places on the planet, including an expansive Siberian crater with no explainable origin, Greenland's bizarre black holes, an ancient forbidden well in the Yemeni desert, and a voluminous void in Antarctica.

Scientists postulate that Earth was once sheathed in ice and complex animals evolved when the planet thawed, due to the release of carbon dioxide.

When a fawn is found stuck in thick, toxic tar, Hope assembles her entire team to wash and care for it in a desperate bid to save its life.

Alaskans trap and hunt for essential food and fur to survive the dark winter.

Brian examines the universal laws of nature; planet size can make a difference between life and death.

Gordon Buchanan returns to Russia to help Dr. Victor Lukarevsky prepare rehabilitated lynx for release back in the wild.

Sir David Attenborough explores the dangerous frontiers created by the world's coasts, where animals fight for survival amid constant change; there are some unexpected residents on Namibia's Skeleton Coast.

Borneo is the richest rainforest island of all; home to 40,000 species of plants and animals, 6,000 of them are unique, and more are discovered almost daily.

Alaskans trap and hunt for essential food and fur to survive the dark winter.

An orphaned baby Triceratops must outwit a deadly Tyrannosaurus rex.

The winter season grows more erratic, and Alaskans are forced to adapt.

With less than a month left in the fishing season, all crews are desperate to catch their remaining quota, and failing to do so means leaving money on the table; Justin and Mike are fighting to hit their target.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

The winter season grows more erratic, and Alaskans are forced to adapt.

With less than a month left in the fishing season, all crews are desperate to catch their remaining quota, and failing to do so means leaving money on the table; Justin and Mike are fighting to hit their target.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

Alaskans trap and hunt for essential food and fur to survive the dark winter.

Brian examines the universal laws of nature; planet size can make a difference between life and death.

With less than a month left in the fishing season, all crews are desperate to catch their remaining quota, and failing to do so means leaving money on the table; Justin and Mike are fighting to hit their target.

Alaskans trap and hunt for essential food and fur to survive the dark winter.

Hope realizes she's not prepared to rescue animals from an oil spill, so she heads across the continent to learn from the best before disaster strikes.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

Hope realizes she's not prepared to rescue animals from an oil spill, so she heads across the continent to learn from the best before disaster strikes.

A perfect circle carved around an ancient peak; a scary phenomenon in the Pacific; strange shapes in a Middle Eastern desert; a formation below the ocean's surface.

How the earth's atmosphere came to be; the one man to have braved the atmosphere's upper reaches and survived.

Hope realizes she's not prepared to rescue animals from an oil spill, so she heads across the continent to learn from the best before disaster strikes.

In anticipation of the coming spring, Alaskans pursue scarce resources.

After Brian explores the bottom of the ocean, he looks to the Solar System to see if there might be other worlds that could harbor life.

The winter season grows more erratic, and Alaskans are forced to adapt.

With less than a month left in the fishing season, all crews are desperate to catch their remaining quota, and failing to do so means leaving money on the table; Justin and Mike are fighting to hit their target.

Five months and more than 2000 miles into his journey, Lev is in Sudan, facing his biggest physical obstacle yet: the Sahara desert; he has to walk 1300 miles across one of the most inhospitable places on Earth.

In anticipation of the coming spring, Alaskans pursue scarce resources.

Pioneers strive to protect the ocean from the effects of human activity.

The Earth's surface is changing faster than ever in human history: cities grow, forests disappear and glaciers melt; a man feeds thousands of parakeets in a city; in Sumatra, a female orangutan and her daughter face life in a forest under threat.

Focusing on faraway landscapes that are bursting with fire and ice; Professor Cox goes on a journey across the solar system for a look at volcanic eruptions so vast they reach into space; learning why these violent explosions hold the keys to life.

In 1996, NASA scientists made a shocking announcement; they claimed they had found evidence of alien life in a meteorite from Mars. This film tackles one of the biggest questions in science - whether there is, or ever was, life on Mars.

The Earth's surface is changing faster than ever in human history: cities grow, forests disappear and glaciers melt; a man feeds thousands of parakeets in a city; in Sumatra, a female orangutan and her daughter face life in a forest under threat.

Focusing on faraway landscapes that are bursting with fire and ice; Professor Cox goes on a journey across the solar system for a look at volcanic eruptions so vast they reach into space; learning why these violent explosions hold the keys to life.

In 1996, NASA scientists made a shocking announcement; they claimed they had found evidence of alien life in a meteorite from Mars. This film tackles one of the biggest questions in science - whether there is, or ever was, life on Mars.

In anticipation of the coming spring, Alaskans pursue scarce resources.

After Brian explores the bottom of the ocean, he looks to the Solar System to see if there might be other worlds that could harbor life.

Pioneers strive to protect the ocean from the effects of human activity.

In anticipation of the coming spring, Alaskans pursue scarce resources.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

The history of the formation of the world's largest freshwater lake system reveals many mysteries surrounding the geological phenomenon.

A long-forgotten network of Native American earthworks; a baffling battlefield mystery in Belgium; a mysterious blood red lake on a remote Greek island; an eerie pink glow emulating form the middle of the Pacific Ocean.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

The differences between the Northern and Southern Rockies.

Traipsing along ancient pathways criss-crossing Easter Island; finding gigantic designs carved into Asia's Eastern Steppe; ascending a tall pyramid rising from Antarctica's icy landscape.

Tackling the grade 6 rapids and untamed waters of the Buller River on the west coast of New Zealand's South Island, blessed by a Māori elder of the Ngāti Apa ki te Rā Tō.

Gordon Buchanan returns to Russia to help Dr. Victor Lukarevsky prepare rehabilitated lynx for release back in the wild.

The big blue is the world's greatest wilderness, far from shore and many kilometers deep.

From forests to undersea prairies, it is the green of the sea that brings life to oceans.

Coasts are the most changeable habitats of the ocean world.

Pioneers strive to protect the ocean from the effects of human activity.

Scientists uncover clues at a fossil dig site in North Dakota that reveal details about the day an asteroid struck Earth and wiped out the dinosaurs.