[wind howling]
[tense music playing]
[Cate Blanchett] On a river in the American Pacific Northwest...
[sloshing]
...the yearly salmon run has collided with the modern world.
[burbling]
[intriguing music playing]
[car engine rumbling]
[foreboding music playing]
[faint engine rumble]
This floodplain used to be easy passage for fish on a mission.
But a road has turned it into a deadly gamble.
[burbling]
The salmon must take their chances...
[car rumbling]
...to reach their spawning grounds upstream.
They are driven by an overwhelming instinct
to swim against the current.
So they've just gotta go.
[suspenseful music playing]
[gushing]
[car engine rumbling]
[suspenseful music rising]
[music stops]
[steady burbling]
And where one succeeds...
others can too.
[rousing music playing]
[sloshing]
[gushing]
[suspenseful music playing]
[rousing music playing]
[rousing music rising]
[music fading]
[steady burbling]
Millions of migrating salmon must today run a treacherous gauntlet.
From the open ocean...
...inland past tarmac, concrete, and steel...
[wondrous music playing]
...these determined travelers will stop at nothing to reach their goal.
If they succeed,
their migration will bring a pulse of vital nutrients in their bodies
that nourishes a vast forest network that spans the Pacific Northwest.
[bear growls]
[huffing]
To stay healthy,
this forest and everything that depends on it...
[wondrous music playing]
...needs its fish.
And these heroic salmon
are just one in a cast of incredible creatures
all over the world...
[snorts]
...whose battles to survive...
[birds chirping, squawking]
...adapt, and reproduce
also have the power to help nurse our ailing planet back to health.
[rousing music playing]
They are our most powerful allies on the Earth's road to recovery.
While they fight for their futures,
they are in fact fighting for ours.
[dramatic music playing]
[trilling]
[music fading]
[dog barking]
[barking continues]
[jazzy music playing]
Humans.
We've done some strange things to this planet.
[jazzy music continues]
By attempting to build our dream homes...
[car horn honking]
...we've created a confusing world for the neighbors.
[squawks softly]
Wherever we've spread,
the dangers we've introduced are causing havoc.
[foreboding music playing]
[music fading]
But one creature has been preparing for the worst...
his entire life.
[insects chittering]
Hunkered down in his Florida bunker...
the ultimate doomsday prepper.
[quirky music playing]
Inside a rock-hard shell six feet underground.
Now that's how you stay safe.
But even a recluse needs to eat.
[quirky music continues]
For a gopher tortoise, leaving your burrow may well be daunting.
[birds chirping, squawking]
But to find fresh shoots, he needs to come out of his shell
and out of his comfort zone.
[chitters, chirps]
Come on, how scary can it be?
Here goes nothing.
[funky music playing]
[chirping]
The neighbors seem pretty harmless.
All busy keeping Florida's longleaf pine forest in tip-top condition.
[croaks]
Pollinators.
Tree planters.
[soft huffing]
Even pest controllers.
[rattling]
[squeaks]
[funky music continues]
But it's best to give some a wide berth.
[sniffing]
[hissing, croaking]
- [insect buzzing] - [sniffing]
[funky music playing]
For our play-it-safe tortoise,
coming out of his shell seems to have paid off...
[birds chirping, warbling]
...with a midsummer feast.
[birds chirping, warbling]
But he can't let his guard down.
[grass rustling]
[tense music playing]
Because high summer is also
wildfire season.
[fire crackling]
[chirping]
It's nature's way of making space for new life to grow.
[fire crackling]
- [insect hissing] - [rustling]
If he can't get back to his burrow,
he'll be cooked in his own shell.
[rock music playing]
Time to put the pedal to the metal.
[heavy metal music playing]
Burning at over 600 degrees...
[loud crackling]
...the fire claims an acre every ten seconds.
[loud crackling]
[heavy metal music continues]
[music fading]
- [fire crackles softly] - [trees rustling]
[serene music playing]
Amazingly...
the tortoise has survived.
But how?
He didn't make it home.
But he has dug safety bunkers all over this forest.
And his doomsday prepping hasn't just saved his own skin.
[hissing, rattling]
Over 300 different species seek shelter from summer wildfires
in the burrows of gopher tortoises.
[rousing music playing]
[sniffing]
He has saved his neighbors.
[hissing]
And as each animal plays its own role in the forest,
together they'll help their home to recover.
[stirring music playing]
We will increasingly rely on heroes like him
as the web of life on which we all depend...
[distorted static]
...is threatened from all sides.
[distorted static]
[wildlife shrieking]
In 2020,
Australia suffered its worst ever bushfire season.
One-fifth of all its forests turned to ash.
Three billion animals killed or harmed.
[trees creaking]
But there may yet be a way to heal this broken land.
A flying fox descends on Downtown Sydney...
[slow tempo music playing]
...with thousands of other fruit bats.
Her forest destroyed, these refugees are trying to survive in a new home.
This world is like no forest she's ever seen.
[car horns honking]
A canopy of concrete.
[cicadas chitter]
Electric branches.
[buses rumbling]
Razor blade undergrowth.
Nothing in 50 million years of evolution has prepared her for this.
[screeching]
But she's learning fast.
And pinpoint night vision helps her find food
even in the heart of the city.
[siren wailing in distance]
[insects chittering]
[bell tolling]
She must eat her fill before dawn.
Because after the night shift, she's got a day job to clock on to.
[bats screeching]
In a park nearby,
what used to be a rest stop for migrating bats,
has now become a permanent roost.
Hiding something truly precious...
her hungry baby waiting for his morning milk.
[leaves rustling]
[soft screeching]
But the day shift brings its own challenge.
[birds chirping, warbling]
Heat.
[tense music playing]
Sydney summers now regularly top 110 degrees.
Far hotter than shaded forests.
And deadly for young bats.
[unsettling music playing]
[birds warbling]
But mom has some neat tricks up her sleeve.
Blood flows through the thin skin of her wings
so she can try to cool down.
And she can fan her pup.
But the temperature is still rising.
[screeching]
He's in trouble.
She must find a way to cool him down.
[tense music playing]
There's one thing left to try.
Water.
[suspenseful music playing]
It calls for a daredevil descent.
[whooshing]
The airspace is crowded...
[suspenseful music rising]
...with fierce competition.
But it's nothing she can't handle.
A single dip soaks her fur.
Enough water to cool her pup...
[screeching]
...with a soggy, life-saving embrace.
Whatever this hostile place throws at her, she will do her best to find a way.
[serene music playing]
And there's more than just her baby's survival at stake.
Because fruit bats have the power to shape the world around them.
[rousing music playing]
Amazingly, each flying fox can pollinate 50 different species of tree...
and spread thousands of seeds in a single night.
Even here in Sydney's parks,
there are signs that they are nursing nature back to health.
[rousing music continues]
[squeaks, chirps]
Over time, if these bats can return to their wilderness home...
[rousing music rising]
...this vast tree-planting air force...
could help regrow their lost forest anew.
[birds chirping, warbling]
[rousing music rising]
[music fading]
The healthier the Earth's wild places,
the harder they work to the benefit of us all...
[birdsong]
[thunder rumbling]
...protecting the air we breathe and the water we drink.
[serene music playing]
The future health of our entire planet
may rest with nature's last great strongholds...
[wildlife calling]
...and their most important inhabitants.
[huffs]
[snorting]
This grandmother has a growing family to support.
[birds chirping, warbling]
Every new baby, a blessing.
But also another mouth to feed.
[huffs]
Forest elephants have demanding nutritional needs.
[cries]
And there's only so much grass you can stomach.
So, it's just as well she has Africa's biggest drugstore
right on her doorstep.
The Congo rainforest.
[wildlife calling]
[birds chirping]
Bulldozing their way through the dense undergrowth is slow-going.
[low growls]
But there's a quicker way.
[grunts, snorts]
A path.
[birds warbling]
[huffs]
Generations of her ancestors have walked these same routes...
creating thousands of miles of elephant-sized corridors...
[elephant roars]
...making it far easier to browse the aisles.
[roars softly]
And this path leads...
[water burbling softly]
...to a forest pharmacy.
[dreamy music playing]
The clay is rich in salts and minerals...
that help them survive the sweltering heat.
[slurping]
Like an isotonic mud drink.
[snorts]
[purring]
But to grow big and strong, this family needs fresh vitamins.
And Grandma knows every trick in the book to find them.
[snorting]
Elephants can hear some of the lowest frequencies
of any animal.
[roaring softly]
[low growling]
And they can even use the sensitive pads of their feet
to pick up the faintest of tremors.
[rumbling]
And that is the sound of fresh fruit hitting the shop floor.
[suspenseful music playing]
[rumbling]
[branch breaks]
[rustling]
Grandma has a bearing...
and she knows the quickest route there.
[snorting]
[trumpeting]
And in their quest for a healthy diet,
wherever this family roams,
they also boost the forest's health.
[huffs]
Each elephant spreads over 200 pounds of mineral-rich compost...
[roars softly]
...and weeds out several miles of choking undergrowth...
[rustling]
...every single day...
[serene music playing]
...which gives the forest's slow-growing saplings
the chance they need to transform into giants.
[wondrous music playing]
Giants with the power to help save us all.
[music fading]
As humans drive up the amount of carbon dioxide in our atmosphere,
this mighty elephant-grown tree is drawing it down.
It then performs one of nature's greatest magic tricks.
[ethereal music playing]
Transforming carbon dioxide into sugars
through the power of sunlight on its leaves.
Locking planet-warming carbon safely away
into its branches, trunk, and roots.
[ethereal music continues]
The work of gardening elephants allows Africa's tropical trees
to draw down an extra billion tons of carbon every single year.
[huffs]
[soft roaring]
[snorting]
These giants could help us turn the tide on rising carbon dioxide levels...
- [elephant purrs] - [birds warble]
...and actually fight climate change.
[elephant huffs]
While Grandma simply searches for what she needs
to keep her family healthy.
[stirring music playing]
[music fading]
But in the last 30 years,
we have lost three-quarters of Africa's forest elephants to poaching.
[wildlife calling]
With so little of our planet's wilderness still intact,
we need its wildlife now more than ever.
Nature's greatest healers are disappearing on our watch.
Species that do most for our planet's health
are amongst those most at risk of extinction.
And as everything is connected to the vast web of life,
their fate could soon become ours.
[spouting]
But what if we could help some of these vital animals...
to rise again?
[wind howling]
[wildlife bellowing]
- [snorts] - [birds chirping]
Saiga antelope.
They once roamed the steppe from Europe to China in their millions.
Grazing and spreading seeds,
these nomads maintained the world's biggest grassland
for millennia.
[snorts]
Until the 1990s,
when rampant poaching devastated their herds.
[unsettling music playing]
Their numbers fell faster than any mammals in history.
And as the grazers disappeared,
so too did the grasslands that depended on them.
[slow tempo music playing]
[bird caws]
[birds chirping]
[sniffs]
But a decade later, saiga hunting was banned throughout their range.
The future of the steppe rested on whether a few survivors
could come back from the brink.
[calf bleating]
A new hope.
And one becomes three.
[bleats]
[bleating continues]
[huffs, grunts]
Tomorrow's grazers ready to roam.
[grunts]
And thankfully, they are not alone.
[birds chirping]
Other saiga mothers have gathered at the nursery grounds.
At a year old, they give birth to twins,
and even triplets.
[snorting]
[bleating]
So with each yearly baby boom,
the herds nearly double in size.
[bleating]
In just 20 years,
a few thousand survivors have become a force a million strong.
[wondrous music playing]
[wondrous music rising]
[birds chirping]
This new generation is ready to reclaim their ancestral home.
Marching for thousands of miles every year.
Breathing life into the grassland wherever they spread.
[rustling]
And securing the future of the steppe for everyone who lives here.
[grunts]
[music fading]
[antelopes bleating]
Scientists have calculated that supporting the return of just 20 large mammal species
could help revive nearly a quarter of all the land on Earth.
[rustling]
[birds chirping, warbling]
[squawking]
So today, a movement is gathering pace across more than 70 countries worldwide...
to hand damaged landscapes back to their natural caretakers
in a process called "rewilding."
[wildlife calling]
In Argentina's Iberá Wetlands, over a million acres of swamps, forests,
and grasslands once thronged with over 4,000 species.
But centuries of cattle ranching drove out the wildlife
leaving this rich tapestry at risk of collapse...
[birds squawking, cawing]
...until the turn of the millennium...
when work began to hand this land back to nature.
[birdsong]
But now, one species is standing in the way of complete recovery.
[funky music playing]
With the cattle gone, clans of capybara are filling the vacuum.
Hundred-pound rodents...
mowing down any new shoots that try to grow.
Which means Iberá's recovery has hit the skids.
[munches, sniffs]
Not that these giant guinea pigs seem worried.
They're so laid back...
[snores]
...they're horizontal.
[snoring continues]
[funky music playing]
But all that is about to change.
[growling]
[electricity whirring]
This pen holds one of South America's most feared predators...
[jaguar growling]
...hunted out here over 70 years ago.
[low growls]
[tense music playing]
This rescued jaguar could solve the capybara conundrum.
While her challenge is feeding her twin daughters.
[suspenseful music playing]
[clanks, squeaks]
Everything now hinges on whether this killer can learn to hunt...
[suspenseful music playing]
...on the other side of the fence.
[low growls]
The first free-roaming jaguars to set foot here since the 1950s.
[rustling]
[low growling]
[grunting, snuffling]
It's all theirs for the taking...
if Mom can just tune into her killer Instinct.
[funky music playing]
Stealth mode.
[tense music playing]
[funky music playing]
[birds chirping, warbling]
Keep low.
[tense music playing]
Get close.
[grass rustling]
[funky music playing]
[twigs snap]
[sniffing]
[birds chirping]
Then wait for your moment.
[cawing]
[grunts]
- [sniffing] - [grass rustling]
[squeaking]
These capybara have only ever danced to their own tune.
[tense music playing]
Until now.
[grunts, squeaks]
[suspenseful music playing]
[jaguar roars, growls]
[capybara squeaks]
[suspenseful music playing]
[growls]
[suspenseful music rising]
Her daughters witness a masterclass
and share the spoils.
They too will become agents of change...
[wildlife calling]
...unlocking the full potential of this vast landscape.
This family of assassins will now bring fear wherever they tread.
[suspenseful music playing]
[barking]
[cawing]
[barking]
[grunts]
The capybara will keep to the waterways where they feel safer.
[squeaking, chirping]
[wildlife calling]
Keeping grazers on the move gives more plants a chance to recover...
so pockets of new habitat can emerge.
[cawing]
And even more species can return to this old cattle ranch...
[birds warbling]
...building their own connections, making it more resilient to change.
[serene music playing]
Iberá's restored webs of life
will help it endure long into the future.
[wildlife calling]
Thanks to the return of one missing piece of the puzzle.
[wildlife screeching]
Empowering nature's healers
can protect us from many of the perils of a changing planet.
[birdsong]
Wildflower meadows boost bee populations...
[buzzing]
...helping secure a quarter of our food supplies
from increasingly unpredictable seasons.
[rousing music playing]
Protecting sea otters revives kelp forests...
which shield coastlines from increasingly stormy seas.
[spouting]
And rising whale numbers fertilize the oceans,
helping to feed blooms of plankton
that capture ten billion tons of carbon every year.
[wondrous music playing]
As much as all our rainforests combined.
[buzzing]
When we help nature, nature helps us.
The signs of a hopeful recovery are there to see.
[music fading]
Across Washington State,
the paths of the mighty salmon run are blocked
by more than 10,000 man-made obstacles.
Numbers of some salmon species have crashed by up to 95%.
[unsettling music playing]
But as we begin to see the bigger picture,
today on one river...
things are about to change.
[crackling, rumbling]
[loud rumbling]
[suspenseful music playing]
[rumbling]
A campaign to tear down old dams
is transforming waterways across North America.
So far, over 1,900 have been dismantled.
[water gushing]
Thousands of miles of rivers can once again run free.
So too can their salmon.
[dramatic music playing]
Finally, they can reach their ancestral spawning grounds.
[dramatic music continues]
As they lay their eggs in the cool, shaded streams...
their journey is complete.
[music fading]
But their legacy will endure.
[huffing]
An entire generation of salmon give up their bodies.
[squawking]
And their death pumps life back into the forest.
[bird cawing]
[rousing music playing]
This vast transfer of nutrients from ocean to land,
from one life to the next,
is the forest's lifeblood...
providing up to 80% of the nitrogen it needs to grow.
[wondrous music playing]
The salmons' offspring will travel downstream
to start their cycle anew.
With our help, their numbers could flourish again,
sustaining an entire web of connections...
from mountain...
[spouting]
...to sea.
Bringing new hope for everyone that relies on them.
[dramatic music playing]
[spouting]
Nature can help heal our world...
if we just give it a chance.
Every living being is an invaluable link in the web of life...
on which, ultimately, we all depend.
[growling]
[buzzing]
In our connected world, every action has consequences.
[rumbling]
And the choices we make
really matter.
Armed with new knowledge,
we can take steps to help nature nurse our planet back to health.
[rousing music playing]
The time to act
is now.
[spouting]
Because it's no longer just a case of whether we can still save nature,
but whether nature can still save us.
[dramatic music playing]