trom

2019-12-21 15:08:50

A Day in the Life of Earth

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YEAR: 2019 | LENGTH: 1 part (58 minutes) | SOURCE: BBC

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If you think the Earth takes millions of years to change, it’s time to think again! Presented by Hannah Fry, this TV special reveals how much our planet can change in just 24 hours. A new era of science allows us to watch as the Earth moves, breathes, shrinks and grows right under our noses. The story is driven by scientists and explorers, and harnesses cutting-edge data, newly launched satellites and blue chip CGI to show us the true personality of the Earth… more dynamic than it’s ever been seen before. Every minute new land is born, every hour tonnes of rock arrive from space, before you go to sleep a cloud of dust from the Sahara will have fertilised the Amazon, and while all that was happening, the ground under your feet moved half a metre. As Hannah explains, Earth’s daily changes are all linked in surprising ways, and – more importantly – we would not be able to survive on the planet without them.

We start with the inner earth – the invisible but hugely dynamic system beneath our feet which constantly rebuilds the planet’s surface. On the island of Stromboli, we climb a volcano with geologist Professor Chris Jackson to see how much lava a single volcano can produce on a daily basis and how that lava builds new land. Chris also reveals what powers the inner earth – radioactive decay beneath of our feet, where heavy elements are constantly decaying into lighter ones – a process that produces the equivalent energy of 27,000 Hiroshima bombs every day. This energy is a crucial driver to plate tectonics and therefore volcanic activity. And the speed with which volcanic activity makes land is crucial – if it didn’t create land faster than erosion destroys it, we would have no land to live on and the world would be one giant ocean.

The story doesn’t stop with new land being made. It’s also constantly being moved. We reveal how the moon not only causes huge movements of water in the ocean – which we know as the tides – but also creates waves of solid rock on land, known as ‘solid earth tides’; a ceaseless shape change which we never notice. When amateur divers Ramon and Veronica Llaneza found red dust in an underwater cave in the Bahamas, little did they know how far it had travelled to get there. Scientist Charlie Bristow has tracked the source of the dust to the Sahara and worked out how huge quantities of solid mud get airborne and carried across the Atlantic – half a million tonnes of it per day! Much of it ends up in the Amazon, where it helps fertilise the rainforest – the lungs of the planet. Meanwhile, in the polar regions, mountains are also being moved – by glaciers, which grind down rock 24-7 and eventually deposit it in the ocean, where it helps trigger another daily change – this time to life.

In the ocean, we follow the daily growth of phytoplankton – microscopic plant life fuelled by the nutrients put into the ocean by erosion. Five billion tonnes of it grow every day and, like all plants, absorb carbon dioxide and release oxygen. In fact, there is so much phytoplankton in the ocean that they are responsible for every second breath we take. The explosive growth of phytoplankton triggers another global change and the biggest mass movement of animal life known to science – the daily migration of the zooplankton, which rise up from the depths every night to feed on the plants. In Florida, we get underwater with a group of intrepid divers, who plunge into the pitch-black ocean for a chance to see this global phenomenon up close. We also look at how science is now able to track the growth of plants on land using satellites. If you could put all the growth in all the world’s forests into one imaginary tree, you would get a single tree three km tall in just one day. But with all this growth, there is an inevitable flipside – fire. The film goes behind the scenes with the US Forest Service as they tackle the biggest wildfire in California’s history. Every day an area of forest twice the size of the Grand Canyon National Park is burnt down.

Finally, Hannah Fry gets us to look outwards. The Earth is not a bubble – it’s part of a bigger cosmic system that every day messes with the composition of our planet. We lose atmospheric gases like hydrogen and helium at the rate of 1kg per second to space. And once they’re gone, they’re gone. In fact, when you look at the Northern Lights, you’re actually looking at helium being lost. But Earth does get something back from space. We join a group of amateur astronomers to watch the Geminid meteor shower in the deserts of California. This heavenly light display is actually revealing a process that goes on all day, every day. The Earth is constantly picking up space dust – an estimated 60 tonnes of it every 24 hours. But perhaps the biggest change of all is the one that few of us are even aware of. Our whole galaxy is moving through the cosmos at two million km per hour.

It really is a different planet every day. If it weren’t, we wouldn’t be on it!

SIMILAR TITLES:

Blue Planet 2Seven Worlds, One PlanetThe Blue PlanetPlanet EarthEarth from SpaceFrozen Planet

BBC Four - A Day in the Life of Earth

Hannah Fry reveals how much the Earth can change in a single day.

^BBC

trom

2015-06-08 16:35:02

Planet Oil: The Treasure That Conquered The World

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YEAR: 2015 | LENGTH: 3 parts (55 minutes each) | SOURCE: BBC

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Documentary series exploring how we’ve become so reliant on oil in little longer than a human lifetime.

episodes:

Episode 01
From the moment we first drilled for oil, we opened a Pandora’s box that changed the world forever. It transformed the way we lived our lives, spawned foreign wars and turned a simple natural resource into the most powerful political weapon the world has ever known. But when exactly did geology turn into such a high-stakes game? In this series, Professor Iain Stewart visits the places that gave birth to the earth’s oil riches, discovers the people who fought over its control and supply, and explores how our insatiable thirst for oil is changing the very planet on which we depend. It’s a journey that will help us answer a fundamental question – how did we become so addicted to oil in little more than one human lifetime?

Episode 02

By the early 1950s, a holy trinity of oil, plastics and fertilisers had transformed the planet. But as Professor Iain Stewart reveals, when the oil producing countries demanded a greater share in profits from the Western energy companies, the oil and gas fields of the Middle East became a focus for coup d’états and military conflict.

In the North Sea, Prof Stewart recalls the race against time to find alternative supplies in the shallow, but turbulent waters both here and in America’s Gulf coast.

The offshore discoveries in the 1970 proved to be a game changer. It marked an engineering revolution; the moment when ‘difficult’ oil and gas (previously unviable sources) could be commercially produced from the ocean depths. It was the moment when Western Europe and the US finally unshackled themselves from their 20th century energy security nightmare.

EPisode 03

As we entered the 21st century, the world was guzzling oil, coal and gas like never before. Despite fears of ‘peak oil’, Professor Iain Stewart discovers that while huge technological advances are helpingextend the life of existing oilfields, new unconventional oil and gas supplies like shale gas and tar sands are extending the hydrocarbon age well into the 21st century.

Given there’s plenty of fossil fuels still in the ground, the spectre of climate change has forced many to ask can we really afford to burn what’s left? In this concluding episode, Iain Stewart argues we face a stark choice.

Do we continue feed our addiction – suck Planet Oil dry – and risk catastrophic climate change, or do we go hell for leather for alternative energy sources, such as nuclear and renewables, to make the transition from our fossil fuel past to a low-carbon future. In which case, how do we make that shift?

SIMILAR TITLES:

Rise of the ContinentsMen of RockA Day in the Life of EarthInside Planet EarthJourney to The Centre of The PlanetSwallowed by a Sinkhole

BBC Four - Colour: The Spectrum of Science

Helen Czerski goes in search of colour to reveal how it has written our planet's story.

^BBC

trom

2017-08-11 22:02:20

Space Volcanoes

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YEAR: 2017 | LENGTH: 1 part (60 minutes) | SOURCE: BBC

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Volcanoes have long helped shape the Earth. But what is less well known is that there are volcanoes on other planets and moons that are even more extraordinary than those on our own home planet. Horizon follows an international team of volcanologists in Iceland as they draw fascinating parallels between the volcanoes on Earth and those elsewhere in the solar system. Through the team’s research, we discover that the largest volcano in the solar system – Olympus Mons on Mars – has been formed in a similar way to those of Iceland, how a small moon of Jupiter – Io – has the most violent eruptions anywhere, and that a moon of Saturn called Enceladus erupts icy geysers from a hidden ocean. Computer graphics combined with original Nasa material reveal the spectacular sights of these amazing volcanoes.

Along the way, we learn that volcanoes are not just a destructive force, but have been essential to the formation of atmospheres and even life. And through these volcanoes of the solar system, scientists have discovered far more about our own planet – what it was like when Earth first formed, and even what will happen to our planet in the future.

SIMILAR TITLES:

The UniverseJourney to the PlanetsThe PlanetsHow The Universe WorksStargazing LiveWonders of the Solar System

BBC Two - Horizon, 2017, Volcanoes of the Solar System

Discover the parallels between Earth's volcanoes and those elsewhere in the solar system.

^BBC

trom

2012-10-22 20:22:32

The Blue Planet

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YEAR: 2001 | LENGTH: 8 parts (30 minutes each) | SOURCE: WIKIPEDIA

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The Blue Planet is a BBC nature documentary series narrated by David Attenborough, first transmitted in the United Kingdom from 12 September 2001. Described as “the first ever comprehensive series on the natural history of the world’s oceans”, each of the eight 50-minute episodes examines a different aspect of marine life. The underwater photography included creatures and behaviour that had previously never been filmed.

episodes:

01. The Blue Planet
Broadcast 12 September 2001, the first episode looks at how ocean life is regulated around the globe by currents and the varying position of the sun. Near a Pacific seamount, there is a large concentration of marine animals because when the current makes contact with the submerged rock, it forces upwardsplankton and other organisms. This in turn attracts other fish to the area that are higher up the food chain, like tuna, and those that are higher still, such as silky sharks. Off South Africa, a similar situation occurs every June when sardines migrate and are pursued by a caravan of various predators. The South Atlantic waters are the roughest, and storms also churn up nutrients to the surface. These feeding grounds have led to the world’s largest albatross breeding colony, on Steeple Jason Island, west of theFalklands. Phytoplankton forms the basis of all sea life, and every night some 1,000 million tonnes of creatures ascend from the deep to search for food. Lunar phases can also have a bearing on events and the mass arrival of Ridley sea turtles on a Costa Rican beach is shown. Herring initiate the most productive food chain, providing sustenance for humpback whales, and Steller’s and California sea lions. In addition, their eggs are nutrition for many, both above and in the sea. Along the coast of California, a migrating gray whale and her calf are targeted by a pod of orcas, who hunt down and kill the calf. Meanwhile another gray whale carcass has sunk to the bottom of the deep sea. Hagfish, a sleeper shark, and other scavengers arrive to feast on the carcass. A year and a half later the carcass is striped to the bone. This episode won an Emmy Award for “Outstanding Cinematography for Non-Fiction Programming”. George Fenton’s work in this episode won another Emmy for “Outstanding Music Composition for a Series (Dramatic Underscore)”. This episode was broadcast in the United States with the title “Ocean World”.

02. The Deep
Broadcast 19 September 2001, the next programme explores the unknown depths of the ocean. Over 60% of the sea is more than a mile deep and it forms the planet’s most mysterious habitat. A sperm whale descends 1,000 metres to look for food and is followed. On the way down, a number of unusual creatures are witnessed, such as transparent squid and jellies, whose photophores give pulsating displays of colour. In such dark places, both being able to see (or sense movement) and the means of quick concealment are equally desirable. To that end, some use bioluminescence as a means of detecting food or evading predators. A descent to the very bottom of the ocean — some 4,000 metres — reveals life even at such cold temperatures, much of it new to science. It is dominated byechinoderms that sweep the sea bed; however, there are occasional large hunters, such as chimaera. In addition, sixgill sharks can grow up to eight metres in length and have remained unchanged for 150 million years. They are described as “living fossils” and relatively little is known about them. As the continental slope flattens out it joins the abyssal plain, which can form huge trenches. At seven miles, the deepest is the Mariana trench, and fish have been found there right down to the very bottom. Attenborough remarks that more is known about the surface of the moon. Species captured on film for the first time include the Dumbo octopus and the hairy anglerfish. This episode was nominated for two Emmy Award for Outstanding Sound Editing and Outstanding Sound Mixing in the non-fiction category. It was also nominated for a BAFTA TV award for Best Innovation.

03. Open Ocean
Broadcast 26 September 2001, the third installment focuses on life in the “marine deserts”: seas that are furthest from land. Such waters contain the swiftest and most powerful of ocean hunters. A feeding frenzy is shown, as striped marlin, tuna and a Sei whale pick off a shoal of sardines until all within it have been consumed. Manta rays also gather to eat the eggs of spawning surgeonfish. Accumulations of plankton correspond to ocean ‘boundaries’ and consequently, schools of fish seek them out. This in turn attracts predators, and a sailfish is filmed on the attack. The only escape for smaller fish is to put as much distance between them and their pursuers as possible. Bluefin tuna are able to heat their bodies and so can hunt in colder conditions than the others of their species. Off the coast of New Zealand, an undersea volcano has formed an island and the nearby currents sweep many kinds of creatures to it, again creating huge feeding grounds. Another Pacific seamount is surrounded by hammerhead sharks, but not to seek food: they are there to allow other fish to clean them of parasites. However, others that are on the lookout for prey arrive in vast numbers. A large pod of common dolphins is too big to feed all at once and so splits up into smaller expeditions. One of these ends up near the Azores with a shoal of mackerel in its sights, but they have to compete for their quarry with an attendant flock of shearwaters and a group of adult yellowfin tuna.

04. Frozen Seas
Broadcast 4 October 2001, the next episode compares oceanic life in the Arctic and Antarctica. The winter in these regions brings temperatures of minus 50°C and frozen seas that create the biggest challenge. However, there are polynyas in the Arctic, which are free of ice owing to the pressure of currents on either side, and such places do provide refuge for some species, like the walrus and thebowhead whale. A pod of belugas is shown: their movements are limited to a single hole in the ice — therefore putting them at risk of attack from polar bears. Everything changes with the arrival of summer, when melting ice brings a variety of migratory visitors. At the other end of the planet, in the Antarctic, winter is even more harsh, but emperor penguins and Weddell seals stay throughout. Under the sea ice,krill shrink in size and revert to their juvenile form in order to save energy. Chinstrap penguins overwinter to the north, beyond the ice, but return during the spring to breed. Having managed to get ashore, they have to walk a great distance to find a nest site, and the most favoured is Zavodovski Island, an active volcano whose warmth keeps ice from forming. Further south, as the sea ice breaks up, humpback and minke whales appear, their target the abundant krill. The leopard seal is the Antarctic’s top predator. It is most effective underwater, and emperor penguins propel themselves at speed through its territory. Nonetheless, it almost invariably makes a kill.

05. Seasonal Seas
Broadcast 10 October 2001, this programme surveys the effects of the seasons on the world’s temperate seas — the most productive on Earth. Sable Island near Nova Scotia boasts the largest colony of grey seals, which breed there when the weather is at its worst. The pups remain marooned for weeks until the spring, when they are strong enough to swim. Spring also heralds the bloom of phytoplankton: it provides food for copepods, and they in turn are prey to jellyfish, which assemble in vast, million-strong swarms. On the Californian coast, giant kelp also flourishes and by summer, grows at the rate of a metre a day. It provides a sanctuary for shoals of fish and sea otters, the latter anchoring themselves to the seaweed when resting and keeping its grazers in check by eating them. Late summer in Alaska sees Pacific salmon heading inshore to breed. However, the level of their favoured river is too low and they are forced to wait in the open sea, where they fall prey to a salmon shark. The early autumn near Vancouver Island, and the temperature drops slowly. There, the last of the year’s baby herring become the focus for a feeding frenzy by diving auks and murres, and marauding rockfish. Pacific white-sided dolphins also inhabit these waters and, when not hunting nocturnally, socialise during the day. As winter arrives in the north, adult herring seek shelter but are hunted by orca, which club the fish with their tails to subdue them by creating waves of pressure.

06. Coral Seas
Broadcast 17 October 2001, the next instalment is about coral reefs, which are so crowded that they play host to a perpetual battle for space, even among the coral itself. It starts life as a larva that becomes a polyp. Having multiplied, it hardens into a limestone skeleton and grows to form a reef. As the community flourishes, animals develop relationships with one another and such a place can feature a huge variety of ocean life. Although corals feed nocturnally on plankton, sunlight] is vital because even though they are animals, each contains millions of single-celled algae. This in turn is the favoured sustenance of the humphead parrotfish, whose jaws are so powerful that it erodes much of the reef into fine sand. Algae also grows on the top of the reef and a battle for grazing rights between shoals ofpowder blue and convict tangs is shown, the former being initially overwhelmed by the latter’s weight of numbers before regaining the upper hand. The night-time hunting of a marbled ray alerts other predators and a group of whitetip reef sharks moves in, from which few are safe. Several breeding strategies are examined, including the acrobatic habits of brown surgeonfish and the colourful courtship of the flamboyant cuttlefish. Humpback whales are visitors to the reef and males establish their seniority by the loudness and strength of their song. Being fixed to the seabed, corals must synchronise their reproduction with lunar phases and the rising spring temperatures.

07. Tidal Seas
Broadcast 24 October 2001, the penultimate episode deals with marine life that is structured around the rising and falling tides. These are caused by the gravitational pull of the orbiting moon, but in some locations, this can also combine with the power of the sun to create a tidal bore. The world’s largest tides are to be found in the Bay of Fundy in Nova Scotia and therefore it is a rich feeding ground. A school offinback whales is closely shadowed by a flock of Cory’s shearwaters. However, they only have a limited time to feed before low tide, when they must retreat and other creatures appear. Elsewhere, some of the latter include sand bubbler crabs, bears (which feed on shellfish) and a snail species that can ‘surf’. The extreme spring tides allow opportunists to forage further, and raccoons are shown tackling a red rock crab. Some larger fish that hunt on the seabed, such as nurse sharks and stingrays, are forced to sit and wait until there is sufficient water in which to swim. A giant horse conch is shown devouring a tulip snail, and hermit crabs battle over its vacant shell. The varying water levels are no obstacle to tarpon: they can breathe air. This enables them to inhabit stagnant areas and hunt in them. The autumn equinox combines with a hurricane off the Bahamas to create a much higher tide than is usual, flooding large parts of the coast. When the sea recedes, it leaves behindsalt: food for brine shrimps and the perfect habitat in which flamingos can breed.

08. Coasts
Broadcast 31 October 2001, the final programme examines the world’s coastal environments, “the most dynamic of all ocean habitats”. The perils of living in such places are highlighted by Marine Iguanas on the Galápagos Islands, whose diet of seaweed is quickly grabbed between crashing breakers. Many shores provide sites in which to breed or lay eggs. Apart from birds, turtles are among other major species to do so, and the mass emergence of flatbacks on Crab Island in Australia is reduced by predatory herons, pelicans and other hunters. Each year, four million seabirds, comprising fourteen species, return to the island of Talan in eastern Russia to nest. By ensuring that all their chicks eventually leave at the same time, they lessen the impact of predators. The rough seas of the Southern Ocean play host to penguins, and a group of them is shown being pursued by an aggressive bull sea lion. The planet’s coldest seas are in Antarctica, and on South Georgia each spring, thousands of Southern elephant seals arrive to breed. A pair of males is shown fighting a bloody battle to control a harem of females. In Patagonia, the social nature of sea lions is shown as they establish colonies, each of them several hundred strong. While in some respects it is an ideal location for the growing young, high tide brings danger for the colony as a pod of orcas habitually goes on the attack. Having snatched a victim, the predator returns to the open ocean to ‘play’ with it.

SIMILAR TITLES:

Blue Planet 2Frozen PlanetSouth PacificPlanet DinosaurSeven Worlds, One PlanetWalking with Dinosaurs

#nature #ocean #water

Blue Planet 2

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trom

2022-06-24 16:55:55

Prehistoric Planet

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YEAR: 2022 | LENGTH: 5 parts (42 minutes each) | SOURCE: BBC

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A documentary that follows dinosaurs recreated with computer-generated imagery living around the globe in the Late Cretaceous period, 66 million years ago. It set out to depict dinosaurs using current paleontological research such as feathered dinosaurs.

episodes:

01. Coasts

A father Tyrannosaurus and his offspring swim across a perilous seaway to feed on a dead giant turtle. Alcione hatchlings take their first flight through a gauntlet of predatory pterosaurs, Barbaridactylus and Phosphatodraco. Tuarangisaurus travel to a bay in search of gastroliths. A male Mosasaurus hoffmanni is cleaned by reef denizens and defends his territory from a rival. Scaphitid ammonites perform an elaborate mating display. A distressed pregnant Tuarangisaurus is targeted by Kaikaifilu.

02. Deserts
Dreadnoughtus males compete for the right to mate. Lizards are hunted by Velociraptor among a group of sleeping Tarbosaurus. A Mononykus forages for termites and investigates new food options after a brief rainstorm. Several types of dinosaurs congregate around a watering hole in Mongolia. Barbaridactylus males compete for females atop a remote plateau. A herd of Secernosaurus brave the harsh gypsum dunes in search of nourishment.

03. Freshwater
Velociraptor hunt pterosaurs on a cliffside by a waterfall. A battle-scarred Tyrannosaurus nurses his wounds and encounters a newcomer. A Deinocheirus seeks relief from biting flies. A female Quetzalcoatlus builds and guards her nest. A mother Masiakasaurus and her family hunt crabs. Elasmosaurs enter an estuary in search of fish.

04. Ice Worlds
Dromaeosaurus stalk an Edmontosaurus herd as they cross a freezing river. Male Ornithomimus raid rival nests to bolster their own. Olorotitan raise their offspring on fertile volcanic fields but contend with biting mosquitoes. Troodon hunt mammals flushed out by a forest fire. A juvenile Antarctopelta scours the forest for a new winter den. A Pachyrhinosaurus herd stands off against a pack of Nanuqsaurus.

05. Forests
Austroposeidon level trees in search of fresh foliage. A herd of Triceratops journey through a cave to find an underground clay lick. A male Carnotaurus sets the stage for an extravagant display. A female Qianzhousaurus uses an autumn storm to her advantage while hunting Corythoraptor. A family of Edmontosaurus evade a forest fire, while an Atrociraptor and Anodontosaurus reap its rewards. Juvenile Therizinosaurus attempt to climb up to a bee nest. Hatzegopteryx hunts Zalmoxes, and patrols the dense undergrowth and seaspray-battered coastline.

SIMILAR TITLES:

Planet DinosaurBlue Planet 2Frozen Planet 2Frozen PlanetSeven Worlds, One PlanetThe Blue Planet

trom

2022-11-09 23:11:23

Frozen Planet 2

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YEAR: 2022 | LENGTH: 6 parts (~60 minutes each) | SOURCE: BBC

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Life in the extreme. In a fragile world of beauty and hostility, nature finds a way to survive and thrive. Sir David Attenborough explores a planet on the brink of major change.

episodes:

01. Frozen Worlds

Journeying from pole to pole, we reveal the surprising frozen worlds that exist across the planet and the remarkable animals that make them their home.

We begin our journey in the far south, in the most hostile place on earth, the frozen continent of Antarctica. After being raised on the ice in winter, emperor penguin chicks find themselves abandoned by their parents in spring. To survive, they must find their own way across the treacherous sea ice to the rich waters of the Southern Ocean.

The waters surrounding Antarctica may be the richest of all, but they are also home to an exceptionally sophisticated predator, the killer whale. To reach their favoured prey, Weddell seals, a family of killer whales have learnt to generate their own waves, washing the seals off their ice floes. It’s a technique that has been passed down over generations and is coordinated by the family matriarch, who can be over 100 years old.

Leaving Antarctica and travelling north, we discover frozen habitats that are created by altitude. The greatest of these is the Himalaya, the tallest mountain range on earth, which contains so much ice and snow it is known as the third pole. In the shadow of the Himalaya lies a vast frozen grassy plain that is home to the fluffiest cat in the world, Pallas’s cat. It may have extremely dense fur, but if it’s to survive the Mongolian winter, it needs to catch lots of gerbils and voles. Easier said than done when you only have short legs and paws that are sensitive to the cold.

North of the Great Steppe lies the boreal forest, which encircles the continents of North America, Europe and Asia, and remains frozen for six months of the year. Prowling these forests in the far east of Russia is the Siberian tiger, the largest cat in the world. In winter, it is on the lookout for black bears hibernating in caves, a high-risk strategy that only a cat of this size would attempt.

Above the boreal forest, we cross into the Arctic Circle, where conditions become so extreme that trees can no longer grow. This is the tundra. Living here are relics of the last ice age, musk ox. In spring, their calves face a far greater danger than the cold, grizzly bears. Encounters can be brutal, but if just a few calves survive the gauntlet, the herd’s future is secure.

To the north of the tundra is the Arctic Ocean, the only ocean that can completely freeze over. Living here is one of the most peculiar animals on earth, the hooded seal. Males have extraordinary inflatable noses, producing a bright red balloon out of their left nostrils. One male hopes this will make him irresistible.

All of the frozen habitats share one thing in common: the threat posed by today’s climate change. Travelling to the island of Greenland, home to the largest body of ice in the northern hemisphere, we witness how global warming is melting its ice cap at faster rates than ever before, with profound consequences for global sea levels. Lastly, we visit the Arctic’s most iconic resident, the polar bear, as a mother bear struggles to provide for her cubs in a world of shrinking sea ice.

02. Frozen Ocean

At the top of our planet lies a magical realm, the Arctic Ocean. After four months of winter darkness, the sun returns to reveal a frozen ocean covered in ice. Mother polar bears emerge from their hillside dens and lead their cubs down to the sea ice to hunt, while a young male and female bear forge a surprising friendship out on the ice.

For others, the frozen sea is a trap. A pod of beluga whales has been confined to an ice hole for five months, slowly starving to death as the food around them runs out. Their salvation lies in the strengthening sun that comes with spring, melting the sea ice, allowing their escape.

Off the east coast of Greenland, the floating pack ice in spring is a nursery ground for harp seals. Mothers and pups have just a few weeks together for the pup to learn to swim before she leaves him to fend for himself. But in today’s warming climate, storms can tip helpless youngsters into the sea before they are strong enough to fend for themselves.

Summer is a time of plenty in the Arctic Ocean as plankton blooms feed millions of tiny mouths, such as bizarre skeleton shrimps, as well as the biggest: bowhead whales. These ancient and long-lived whales arrive en masse every year at secret locations known as whale spas. But today, with the loss of summer sea ice, their peace is shattered by orcas from the south. These daring predators are bold enough to take on the much larger bowheads, targeting their vulnerable calves.

The 24-hour daylight of the Arctic summer attracts visitors from afar, including huge flocks of seabirds like crested auklets. A male must use both his song and a secret tangerine perfume if he is to attract a mate. For the resident walrus, the summer heat can be unbearable. After hauling himself to the beach to moult, an old male uses an ingenious technique to get himself back to the cool of the water – a roly-poly!

Summers in the Arctic today bring record-breaking heat. With climate change, it is warming faster than anywhere else on Earth. It is predicted that the Arctic Ocean could become ice-free each summer by 2035, raising new challenges for polar bears. Without sea ice, more and more bears are becoming stranded on remote Arctic islands. It’s a dangerous place to be for a mother bear with cubs, surrounded by larger, predatory males.

03. Frozen Peaks

Mountains create frozen habitats on every continent on Earth, and each of these high-altitude worlds holds unique challenges for its surprising and remarkable life.

We begin our journey close to the equator – the furthest point from the poles – in East Africa. Here on the high slopes of Mount Kenya, during the day the tropical sun keeps the cold at bay, but at night the frost descends. During this cycle of freeze and thaw, a pregnant high-casqued chameleon must choose the right time to give birth if her newborns are to escape the deadly night freeze.

Away from the equator in the European Alps, long cold winters give way to short, bountiful summers. For a pair of golden eagles raising their chick, the demand to provide enough food for it drives them to tackle prey five times their size. To catch a goat-like chamois, they risk it all using one of the most daring and breathtaking hunting techniques ever witnessed.

The mountains of Japan are the snowiest place on Earth, providing hostile conditions for a lone male macaque cast away from his troop. His only chance of survival comes with finding another male whose embrace will provide him with life-saving warmth. But in the frozen peaks, the deadliest force is an avalanche whose full destructive power is captured for the first time using high-speed camera racer drones.

The roof of the world is home to an array of unexpected cold-loving creatures. In the remote Southern Alps of New Zealand, a species of parrot – the kea – uses its famed intelligence to feed on the dead. And in the Andes in South America, flamingos thrive in high-altitude volcanic lakes, but their chicks must race to escape the winter freeze or risk becoming trapped in the ice.

Today, due to climate change, our frozen peaks are undergoing rapid change. Using groundbreaking time-lapse photography, we reveal mountain glaciers vanishing before our very eyes and discover what a warming world may mean for our most famous mountain resident of all, the giant panda.

04. Frozen South

Antarctica is the most hostile of all earth’s frozen worlds. Yet even here, amongst some of the most challenging conditions on the planet, life finds a way not just to survive, but thrive.

Our journey begins at the far edge of the continent, on its far-flung sub-Antarctic islands. Here we meet king penguins that, to feed at sea, must face the danger of ferocious leopard seals lurking in the shallows. On another island, we witness for the first time male Antipodean wandering albatross partnering up with each other as the females in their population are disappearing due to fishing activity.

Heading towards the continent of Antarctica, we traverse the roughest seas on earth – the Southern Ocean – where we find the rarely filmed Antarctic blue whale, the largest animal to have ever lived. At the edge of Antarctica, the sea is so cold that it freezes over, creating a vital ice platform for a mother Weddell seal to raise her precious pup. Still, she needs to protect him from aggressive males.

In spring, the coast of Antarctica is free of snow, drawing in thousands of breeding chinstrap penguins. Stones are at a premium to build their elevated nests and protect chicks from meltwater. But stealing is commonplace, and to make matters worse, with climate change we find chicks today shivering with hypothermia – a warming Antarctica means increased meltwater. Other residents are facing an uncertain future too, including wave-washing killer whales. We discover that their favourite prey, Weddell seals, are now harder to reach, so instead they are resorting to targeting much more feisty prey, including leopard seals, an apex predator in its own right. This dramatic encounter has never been filmed before.

Travelling into the interior of the continent – into the frozen heart of Antarctica – we find great surprises. This is one of the most volcanic regions on earth, and one of the driest. We reveal unexpected sand dunes, hidden in a rare ice-free valley. Then, on the exposed mountain tops, sticking out from the otherwise ice-covered interior, we find tiny snow petrels, which raise their chicks further south than any other bird, and defend their territory by projectile vomiting!

The greatest revelation lies deep in the interior, beneath the surface of an ice-covered lake, where we discover ancient alien-like structures – giant stromatolites – built by primitive lifeforms. If life can make it here, in the extremes of Antarctica, it raises the possibility that life can exist elsewhere, including in the frozen lakes of distant planets.

05. Frozen Lands

In the far north of our planet lies the largest land habitat on earth, home to snow-covered forests and the icy open tundra. These are lands of extremes that push animals to their limits: in winter they are so cold that much of the ground has remained frozen since the last ice age. To stand any chance of survival, animals must adapt in extreme ways: here a super pack of wolves, 25 strong, has come together to take on the only large prey available to them in winter, American bison.

On the featureless tundra, an Arctic fox must strike a living alone. She is a wanderer and will roam many hundreds of miles searching for tiny lemmings, hidden deep underground. The only way to reach them is with a head dive. In the remote far east of Russia, a rare Amur leopard prowls the seemingly empty, snow-covered forest. With little prey available, it must use its ingenuity to find a meal. It follows crows in the hope of finding carrion, but it must not stay long, for it shares the forest with a far larger but equally hungry big cat, the Siberian tiger.

As spring arrives, the forests begin to thaw and life returns. Beneath the ground, a nest of tiny painted turtle hatchlings now emerge, having remained frozen in a state of suspended animation throughout winter. To the north, it is a further month before the sun’s warmth baths the frozen ground of the tundra. Tucked away underground lies a tiny snow queen – a Lapland bumble bee. She is the sole survivor of her colony – the rest perished in the winter freeze – but her larger size, her furry body and antifreeze in her blood have allowed her to survive. Now she is in a hurry. She must feed herself and raise a brood in the brief window of summer while the flowers are in bloom.

Snowy owls also use the open tundra to breed: one pair have raised a nest full of fluffy chicks. With 24-hour daylight in which to hunt, the dedicated parents bring back meal after meal for their ever-growing brood. But one day, they return to find the nest empty…

Today, the biggest challenge in the tundra is climate change. Warming summers are melting the permafrost deep within the soil, causing the ground to thaw and, in places, the land to collapse. These changes are impacting the animals too. Caribou arrive in herds of 200,000 individuals to raise their calves in the rich pastures, but warming means mosquitos emerge sooner and bother the calves before they have had a chance to gain strength. The parents drive their young to cooler, mosquito-free land, but to get there they must cross rivers running with increased meltwater and escape hungry grizzly bears. They, like much of the tundra’s wildlife, are adapted to live in the extremes – but the challenge of today’s warming climate could be one extreme too many.

06. Our Frozen Planet

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

Our journey begins in the Arctic, where every summer huge quantities of ice calve from the edges of Greenland’s melting glaciers. On top of the ice cap itself, glaciologist Alun Hubbard descends into a moulin to try to understand the mechanisms that are driving this historic loss of ice.

Elsewhere in the Arctic, it’s not just land ice that is disappearing. In the Gulf of St Lawrence, Canada, biologists are trying to find out how the loss of sea ice will impact the lives of baby harps. In Arctic Russia, with the loss of summer sea ice, more and more polar bears are arriving on the island of Wrangel. Here, a local ranger and scientists are braving the hungry bears to assess their future survival.

Loss of sea ice impacts not just wildlife but people too. In the remote community of Qaanaaq, Greenland, local Inuit hunters are finding the ice too dangerous to travel and hunt on, risking their traditional way of life. And these changes happening in the Arctic have the potential to affect people far beyond. On Alaska’s open tundra, bubbling lakes hint at the gases being released from the previously frozen soil, including the potent greenhouse gas methane.

There is one place where the full scale of a melting Arctic can be best witnessed – from space. Based in the International Space Station, astronaut Jessica Meir looks down at forest fires across Europe and reflects how our changing weather patterns are interconnected.

Rapid ice loss is also happening across the high mountains of the planet’s continents. Glaciologist Hamish Pritchard uses a sophisticated helicopter-strung radar system to try to quantify how much ice is left in the previously uncharted glaciers of the Himalayas. It’s important as, downstream, some 1.2 billion people rely on glacial meltwater as their primary source of fresh water.

Finally, in Antarctica, we meet Bill Fraser, who has dedicated 45 years of his life to studying the Adelie penguin. Over this period, he has witnessed changes in weather conditions and the extinction of entire colonies. These ‘canaries in the coal mine’ are a sign that all is not well, even in the remotest place on earth. And changes here have the potential to affect all of us, so an international group of scientists is on an urgent mission to assess the stability of a huge body of ice known as the Thwaites ice shelf. If this plug of ice melts and slips into the ocean, it will raise global sea levels, impacting coastal communities across the planet.

The unprecedented changes our scientists are witnessing may be profound, but there is hope that, through a combination of technology and willpower, there is still time to save what remains of our frozen planet.

SIMILAR TITLES:

Frozen PlanetBlue Planet 2Seven Worlds, One PlanetThe Blue PlanetNature’s Great EventsPlanet Earth

BBC One - Frozen Planet II

How Earth's breathtaking frozen wildernesses are changing before our eyes.

^BBC

trom

2012-10-23 17:19:18

The Great Rift, Africa’s Wild Heart

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trailer

https://videos.trom.tf/videos/embed/hNgA158SrJxwMfqFeB9DPF?autoplay=0&title=0&warningTitle=0&peertubeLink=0


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YEAR: 2010 | LENGTH: 3 parts (60 minutes each) | SOURCE: BBC

description:

The Great Rift: Africa’s Wild Heart (released in the US as The Great Rift: Africa’s Greatest Story) is a British nature documentary series, which began airing on BBC Two on 24 January 2010. ABBC/Animal Planet co-production, the three-part series focuses on the landscape and wildlife of theGreat Rift Valley in East Africa.

The series received its US broadcast premiere in August 2010 on Animal Planet, where it was screened as a two-hour special under the shortened title Great Rift. Narration for both the BBC and Animal Planet versions was provided by Hugh Quarshie.

episodes:

01. Fire

Visible from space, Africa’s Great Rift Valley runs three thousand miles from the Red Sea to the mouth of the Zambezi. It’s a diverse terrain of erupting volcanoes, forest-clad mountains, spectacular valleys, rolling grasslands, huge lakes and mighty rivers, and is home to crocodiles, hippos, lions, elephants, flocks of flamingos and a diversity of indigenous peoples.

Using state-of-the-art high definition filming techniques, this series investigates the geological forces which shaped East Africa’s Great Rift, and which make it one of the world’s most wildlife-rich landscapes.

The valley is the product of deep-seated geological forces which have spewed out a line of cloud-wreathed volcanoes stretching from Ethiopia to Tanzania. Their peaks provide a refuge for East Africa’s most extraordinary wildlife, including newly discovered and previously unfilmed species which have evolved surprising survival strategies to cope with their challenging mountain environment.

02. Water

Visible from space, Africa’s Great Rift Valley runs three thousand miles from the Red Sea to the mouth of the Zambezi. It’s a diverse terrain of erupting volcanoes, forest-clad mountains, spectacular valleys, rolling grasslands, huge lakes and mighty rivers, and is home to crocodiles, hippos, lions, elephants, flocks of flamingos and a diversity of indigenous peoples.

Using state-of-the-art high definition filming techniques, this series investigates the geological forces which shaped East Africa’s Great Rift and which make it one of the world’s most wildlife-rich landscapes.

The Great Rift Valley channels a huge diversity of waterways – rivers, lakes, waterfalls, caustic springs and coral seas – spanning from Egypt to Mozambique. Some lake and ocean deeps harbour previously unseen life-forms, while caustic waters challenge life to the extreme. But where volcanic minerals enrich the Great Rift’s waterways, they provide the most spectacular concentrations of birds, mammals and fish in all Africa.

03. Grass

Visible from space, Africa’s Great Rift Valley runs three thousand miles from the Red Sea to the mouth of the Zambezi. It’s a diverse terrain of erupting volcanoes, forest-clad mountains, spectacular valleys, rolling grasslands, huge lakes and mighty rivers, and is home to crocodiles, hippos, lions, elephants, flocks of flamingos and a diversity of indigenous peoples.

Using state-of-the-art high definition filming techniques, this series investigates the geological forces which shaped East Africa’s Great Rift and which make it one of the world’s most wildlife-rich landscapes.

The Great Rift Valley provides the stage for an epic battle between trees and grass – its course influenced by volcanic eruptions, landscape and rainfall. On its outcome rests the fate of Africa’s great game herds. In the Rift’s savannas, grazers and their predators struggle to outwit each other, forcing one group of primates to develop a social system that paved the way for the evolution of mankind.

SIMILAR TITLES:

Seven Worlds, One PlanetFrozen Planet 2Earth’s Tropical IslandsBlue Planet 2Nature’s Great EventsPlanet Earth

#animals #nature

BBC Two - The Great Rift: Africa's Wild Heart

Series investigating the geological forces which shaped East Africa's Great Rift Valley

^BBC