BBC: Planet Earth English Subtitles

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A hundred years ago

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there were one and a half
billion people on Earth.

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Now, over six billion
crowd our fragile planet.

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But even so, there are still places
barely touched by humanity.

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This series will take to the last wildernesses

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and show you the planet
and its wildlife

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as you have never
seen them before.

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Imagine our world without sun.

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Male Emperor Penguins are facing

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Human beings venture into the highest
parts of our planet at their peril.

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Some might think that
by climbing a great mountain

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they have somehow conquered it,

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but we can only be visitors here.

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This is a frozen alien world.

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This is the other extreme -

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one of the lowest hottest places
on Earth.

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It's over a hundred meters
below the level of the sea.

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But here a mountain is in gestation.

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Only 3 percent of the water
on our planet is fresh.

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Yet these precious waters
are rich with surprise.

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All life on land is ultimately
dependent upon fresh water.

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The mysterious tepuis of Venezuela -

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isolated mountain plateaus
rising high above the jungle.

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This was the inspiration
for Arthur Conan Doyle's 'Lost World,'

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an imagined prehistoric land.

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Here, strange towers of sandstone
have been sculptured over the millennia

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This is our planet's final frontier,

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an inner world where only
the most adventurous dare to go.

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Beneath our feet

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are countless miles
of cave shafts and passages.

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The Cave of Swallows in Mexico,

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400 meters to the bottom,

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deep enough to engulf
the Empire State Building.

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This is the biggest
cave shaft in the world.

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Yet these depths were
first explored

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A third of the land
on our planet is desert.

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These great scars
on the face of the Earth

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appear to be lifeless,

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but surprisingly none are.

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In all of them life manages somehow

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to keep a precarious hold.

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Not all deserts are hot.

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Fifty-mile-an-hour winds
blowing in from Siberia

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bring snow to the Gobi Desert
in Mongolia.

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Both poles of our planet are covered with ice.

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They're the largest and most demanding
wildernesses of all.

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Nowhere else on Earth
is seasonal change so extreme.

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It causes the ice to advance
and retreat every year

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and all life here is governed by that.

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When the first polar explorers headed south

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giant cathedrals of ice marked their entry
into uncharted territory.

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Passing the towering spires they must've wondered
what unearthly sights lay in store.

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As they battled on

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Vast open plains.

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Immense spaces.

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Eerie silence

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but any feeling of emptiness
is an illusion.

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The plains of our planet

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support the greatest gatherings
of wildlife on Earth.

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At the heart of all that happens here

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is a single living thing.

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Grass.

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This is our planet's hothouse.
The jungle.

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The tropical rainforest.

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Forests like these occupy only three percent
of the land

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yet they're home to over half
of the world's species.

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But how do so many different kinds of plants
and animals

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find the space here to live
alongside one another?

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On the dark, humid forest floor
the jungle appears to be lifeless.

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Often the only signs of life
are what you hear.

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Our planet's continents are fringed
by shallow seas.

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Rarely more than two hundred meters deep
they lie on the continental shelves

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which may stretch sometimes
for hundreds of miles

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before the sea floor drops into
deeper darker waters.

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All together they constitute
a mere eight percent of the world's oceans

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but they contain the vast majority
of it's marine life.

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A male humpback whale sings to attract a mate.

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The whales have just returned
to their breeding grounds

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Trees.

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Surely among the most magnificent
of all living things.

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Some are the largest organisms on Earth

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dwarfing all others,
and these are the tallest of them all.

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The deciduous and coniferous woodlands
that grow in the seasonal parts of our planet

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are the most extensive forests on Earth.

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Their sheer extent stuns the imagination.

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The barren snows of the Arctic.

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A thousand miles from the North Pole,
and heading south.

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Away from all land

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the ocean.

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It covers more than half the surface
of our planet

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and yet for the most part
it is beyond our reach.

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Much of it is virtually empty

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a watery desert.

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All life that is here
is locked in a constant search to find food

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a struggle to conserve precious energy

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in the open ocean.

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