<i>male narrator: The human race
is under attack</i> <i>from the most devastating
weather disaster</i> <i>to ever strike
the modern world.</i> - The magnitude of something
like this is a game-changer for the entire planet. <i>narrator: Blizzards,
hurricanes, wildfires,</i> <i>massive floods,
hellish destruction</i> <i>that can only be caused
by one phenomenon,</i> <i>the shutdown of the world's
ocean currents.</i> <i>- You screw with an ocean
weather system,</i> the climate goes
out of control. - [screaming] <i>[dramatic music]</i> - It is the end of the world
as we know it. <i>narrator:
Will you be ready...</i> <i>when doomsday strikes?</i> <i>Can any of us survive?</i> <i>♪ ♪</i> <i>Ocean currents
control our climate</i> <i>by transferring heat
and moisture from the water</i> <i>into our atmosphere,</i> <i>thereby influencing
temperatures around the world.</i> <i>♪ ♪</i> <i>12,000 years ago,</i> <i>as the last ice age
was ending,</i> <i>the global ocean
currents shut down,</i> <i>and much of the world
slipped back</i> <i>into a deep freeze</i> <i>that lasted for over
a thousand years.</i> <i>♪ ♪</i> <i>If the ocean currents
shut down today,</i> <i>what would happen
to our planet?</i> <i>Could we survive?</i> <i>♪ ♪</i> - This isn't some
far-flung fictional thing. [all screaming] This is the beginning
of a global climactic shift that is almost
too much to survive. It'll be a very slow,
painful, horrible death. - It's not a question
of if it will happen. It's almost certainly
a question of when. <i>[dramatic music]</i> <i>♪ ♪</i> <i>narrator: Boston's Fenway Park.</i> <i>♪ ♪</i> <i>Red Sox fans are
enjoying the game...</i> <i>when suddenly...</i> <i>the oldest ballpark
in the U.S.</i> <i>is hit with a deluge
of water.</i> [all yelling] - This is beyond bad weather. <i>♪ ♪</i> Boston will be
wiped off the map. <i>♪ ♪</i> The entire eastern seaboard
is going to drown. <i>♪ ♪</i> <i>narrator: The destruction
in Boston</i> <i>is the result
of a catastrophe</i> <i>scarier than anything
mankind has ever faced,</i> <i>one that begins decades
earlier.</i> <i>In 2015,
scientists discover</i> <i>that something disastrous
is happening</i> <i>to the system of
ocean currents</i> <i>known as the global
ocean conveyor belt.</i> - The global
ocean conveyor belt is the circulation system
of the Earth's oceans. <i>♪ ♪</i> <i>narrator: The main driver
of the global ocean</i> <i>conveyor belt happens
in the north Atlantic.</i> <i>Like a giant factory
conveyor belt,</i> <i>warm water moves
from the tropical equator</i> <i>to the northern
Atlantic Ocean,</i> <i>where it turns cold,
salty, and dense.</i> <i>This denser water then sinks</i> <i>and flows south
along the sea floor,</i> <i>enabling the warmer water
to continually flow</i> <i>above it from the tropics.</i> <i>The cold water travels
through all the world's oceans</i> <i>until it mixes
with warmer water</i> <i>and returns to
the north Atlantic</i> <i>to repeat the cycle.</i> - Like the blood vessels
in your body that transport nutrients
all throughout your system, <i>large currents
transport energy</i> and heat all
throughout the ocean. <i>narrator: The ocean currents
are vitally important</i> <i>because they distribute heat
that affects the climate</i> <i>around the world.</i> - 700 light bulbs
per person per year could be continuously lit by just that amount of heat
transported by the ocean. ♪ ♪ <i>narrator: But now,
an international</i> <i>scientific expedition</i> <i>makes a startling discovery
in the north Atlantic.</i> <i>Because of global warming,</i> <i>melting ice in Greenland</i> <i>has flooded the surface
of the ocean with fresh water,</i> <i>diluting its saltiness so it
doesn't sink anymore.</i> <i>Without the motion
of this sinking water,</i> <i>the conveyor belt
has stopped completely.</i> <i>♪ ♪</i> - The oceans drive
weather systems. You screw with an ocean
weather system, the climate goes
out of control, and then it kills you. <i>♪ ♪</i> <i>narrator: And this unleashes
a chain of disasters,</i> <i>a domino effect.</i> <i>Some will strike quickly.</i> <i>Others will take years,</i> <i>even decades to unfold.</i> <i>- You would think you're just
flooding the north Atlantic</i> <i>with a little fresh water,
no big deal,</i> but a very delicate
web that's been woven, and breaking one strand could have
a catastrophic effect <i>across the globe.</i> <i>♪ ♪</i> <i>narrator: At first nobody
notices the effects</i> <i>of the ocean current shutdown.</i> <i>Life goes on as normal.</i> <i>♪ ♪</i> <i>But six months later
the disaster surfaces.</i> <i>People in northern Europe</i> <i>are the first
to suffer the wrath.</i> <i>They typically live
in a mild climate year-round</i> <i>thanks to the heat released</i> <i>from warm surface
currents in the Atlantic,</i> <i>but without this hot air,</i> <i>a cold Arctic blast
assaults the region.</i> <i>♪ ♪</i> - You'll have much colder wind dropping down
from northern latitudes, <i>and the climate will begin
shifting dramatically,</i> <i>especially in Europe.</i> - Without warm water
continuously flowing into northern Europe, temperatures will
begin to drop. <i>[dramatic music]</i> <i>♪ ♪</i> <i>narrator: The effects
of the deep freeze</i> <i>quickly ripple
around the world.</i> <i>♪ ♪</i> <i>A cargo ship from New York
is headed for Hamburg, Germany,</i> <i>the second-largest
port in Europe,</i> <i>but the harbor is iced in.</i> <i>The head
of the Port Authority</i> <i>orders icebreakers
to free up the ships.</i> <i>This is the worst winter
he and people</i> <i>across the northern hemisphere
have ever experienced.</i> <i>♪ ♪</i> <i>Intense blizzards
bring hurricane-force winds</i> <i>and mountains of snow.</i> - The snowstorms would be
dropping feet of snow an hour, <i>and the general temperatures</i> <i>being around
27 degrees Fahrenheit,</i> that will freeze very fast
and very hard. <i>♪ ♪</i> <i>narrator: A tourist
heading for Paris</i> <i>is caught off guard
by sudden whiteout conditions.</i> <i>♪ ♪</i> <i>Emergency services can't get
through the snow</i> <i>to help him or dozens
of other trapped victims.</i> <i>Now the cold</i> <i>becomes a killer.</i> <i>- Hypothermia's terrifying.</i> <i>It's when your core
temperature gets too low</i> <i>for your body
to sustain itself.</i> Your muscles start
to cramp. You start to get
labored breathing. <i>You will actually
run a fever</i> <i>as your body is trying
to keep your body alive,</i> and then your core
temperature will crash. <i>Your body is shutting down
'cause it's too cold,</i> and you will literally
freeze to death. <i>♪ ♪</i> <i>narrator: Northern Europe
is doomed to remain</i> <i>in a deep freeze,</i> <i>and the death toll
will continue to rise.</i> <i>Meanwhile, the climate
disaster spreads</i> <i>across the Atlantic
to the U.S.</i> <i>In Massachusetts Bay,</i> <i>freezing air rushing down
from the north Atlantic</i> <i>stirs up
a major storm front.</i> <i>♪ ♪</i> <i>A family of lobstermen</i> <i>is headed out to sea
when they get the alert.</i> [beeping] <i>♪ ♪</i> <i>100 miles wide,</i> <i>85-mile-an-hour winds,</i> <i>it's a Nor'easter
unlike anything</i> <i>the lobstermen
have ever experienced.</i> <i>♪ ♪</i> <i>Normally they hit between
autumn and early spring,</i> <i>but this Nor'easter comes
in the middle of summer.</i> <i>♪ ♪</i> - We would be having
increased frequency and intensity of Nor'easters
affecting us here in Boston... <i>♪ ♪</i> and those would be occurring
with much greater strength. <i>♪ ♪</i> <i>narrator: The super storm
sweeps through Boston,</i> <i>inundating the city
with 15 feet of icy seawater.</i> <i>It swamps the subways</i> <i>and turns streets
into rivers.</i> <i>Thousands escape the flooding</i> <i>by moving to higher ground,</i> <i>but some people in Boston
are all but helpless</i> <i>as they're dragged
to their deaths.</i> <i>♪ ♪</i> - It's a huge,
terrifying catastrophe. You have the complete collapse
of a society on both a local
and global scale. <i>♪ ♪</i> <i>narrator: From Boston
to northern Europe,</i> <i>as images of
the catastrophe spread,</i> <i>people around the world brace
themselves for the worst</i> <i>by fortifying shelters</i> <i>and stockpiling food, water,</i> <i>and other essential supplies,</i> <i>but will it be enough?</i> <i>Can anyone on Earth</i> <i>survive
the deadliest disaster</i> <i>in human history?</i> <i>♪ ♪</i> <i>narrator:
Global ocean currents,</i> <i>which regulate heat and
rainfall around the world,</i> <i>have shut down,</i> <i>unleashing violent changes
in the weather</i> <i>on both sides
of the Atlantic.</i> <i>Frigid temperatures paralyze
much of the northeastern U.S.</i> <i>In Boston,
freak storms flood the city,</i> <i>leaving tens
of thousands homeless</i> <i>and many more dead.</i> <i>Meanwhile in Europe,</i> <i>the area first affected
by the ocean current shutdown,</i> <i>death by hypothermia
is becoming a daily event.</i> <i>As the crisis deepens,
what will happen to humanity?</i> <i>Can we survive?</i> <i>[dramatic music]</i> <i>♪ ♪</i> <i>A year into this catastrophic
new weather pattern,</i> <i>the people of New York City
now face the wrath.</i> <i>♪ ♪</i> <i>Off the coast,
a massive cyclone,</i> <i>twice the size and strength
of 2012's Hurricane Sandy,</i> <i>roars inland.</i> <i>Monster winds and waves
slam into the Statue of Liberty</i> <i>and then barrel
towards shore.</i> <i>♪ ♪</i> <i>- A storm twice
as powerful as Sandy</i> <i>is not even conceivable.</i> This is destruction
on a massive scale. <i>narrator: 30-foot waves
and 100-mile-per-hour winds</i> <i>explode through
windows and doors,</i> <i>tearing buildings apart
at the seams</i> <i>and dragging people
deeper underwater.</i> <i>♪ ♪</i> - You have rain,
wind, chaos, panic, and disorder all assaulting
a city at once. <i>It would be panic
in the streets.</i> <i>Some people will be
able to survive,</i> <i>but unless you have
the resources</i> <i>and you have the
wherewithal, you won't.</i> The best thing to do
would be to get out. <i>narrator: And while
the northeastern U.S.</i> <i>is battered
by super storms,</i> <i>♪ ♪</i> <i>the apocalyptic effects
of this disaster</i> <i>start traveling south.</i> <i>The next target
is Brazil.</i> <i>Locals are enjoying the beaches
of Copacabana and Ipanema</i> <i>when suddenly the weather
turns violent.</i> <i>[dramatic music]</i> <i>♪ ♪</i> <i>narrator: Monsoons and
75-mile-per-hour winds</i> <i>rage ashore.</i> <i>♪ ♪</i> <i>As the storm surges through
the city of Rio de Janeiro,</i> <i>it becomes a death trap
for locals and tourists</i> <i>who are violently pulled
under the swift-moving water.</i> <i>♪ ♪</i> <i>And as people flee
for higher ground,</i> <i>they face another killer.</i> [all screaming] <i>Storm water rapidly collects</i> <i>on the steep slope
of the Serrana Mountains.</i> <i>The water-soaked ground
loosens,</i> <i>creating an 80-foot swell
of mud, rocks, and water.</i> <i>♪ ♪</i> <i>The landslide flattens
the shanty slums</i> <i>that cling to the mountainside.</i> <i>Thousands of people
are buried alive.</i> <i>♪ ♪</i> <i>As the climate catastrophe
ripples around the world,</i> <i>it finally reaches
the Pacific Ocean,</i> <i>where the shallow coastal water
is now unusually hot</i> <i>due to the shutdown
of the ocean currents.</i> <i>- Whenever we have
warmer water,</i> <i>we tend to have stronger
hurricanes or typhoons</i> that form there 'cause they
really get their energy from the warm surface water,
and if that is warming up, there's gonna be more energy
to power those big storms. <i>♪ ♪</i> <i>narrator:
In Puerto Vallarta, Mexico,</i> <i>a group of American tourists
run for their lives</i> <i>as a category five
hurricane slams ashore</i> <i>with 60-foot waves
and 165-mile-per-hour winds.</i> <i>♪ ♪</i> <i>The vacationers' desperate
cries for help</i> <i>are barely heard over
the turbulent storm water</i> <i>that pulls them out to sea.</i> <i>♪ ♪</i> - Puerto Vallarta will
be ripped apart by a constant barrage
of super cyclones. These are massive storms that will just walk right
over the peninsula and wipe out cities. <i>They will be gone.</i> <i>It's not just, "A cyclone hit.
We can rebuild."</i> It's, "Oh, a cyclone hit,
and here comes another one, and there's one after that." <i>narrator: Puerto Vallarta
is merely the latest victim</i> <i>as towns, villages,
and cities</i> <i>from Central
to South America</i> <i>get buried under water.</i> <i>♪ ♪</i> <i>As the effects of the ocean
current shutdown</i> <i>spread around the world,</i> <i>no place is immune
from this disaster</i> <i>which has already killed over
tens of thousands of people.</i> <i>But these catastrophes
are just the beginning.</i> <i>There's a new threat
to our survival</i> <i>emerging at the bottom
of the world.</i> <i>narrator: The ocean
conveyor belt of currents</i> <i>that help regulate
temperatures around the globe</i> <i>has come
to a grinding halt</i> <i>with consequences that are
threatening our very existence.</i> <i>[dramatic music]</i> <i>♪ ♪</i> <i>A decade into the disaster,</i> <i>the shutdown
of the ocean currents</i> <i>has set off a series
of extreme weather disasters</i> <i>across the world</i> <i>from super storms
and severe drought</i> <i>to massive hurricanes</i> <i>and blizzards.</i> <i>Nearly a half-billion people
have already died.</i> <i>As the death toll climbs,</i> <i>temperatures continue
to plunge</i> <i>in the cold regions
of North American</i> <i>and northern Europe.</i> <i>♪ ♪</i> <i>With warm ocean
currents no longer</i> <i>flowing up
to the north Atlantic,</i> <i>the surface water
remains cold,</i> <i>creating frigid temperatures
across northern Europe</i> <i>with winters that last
for ten months.</i> <i>♪ ♪</i> <i>Snow falls relentlessly
in Germany.</i> <i>The head of the country's
busiest seaport</i> <i>once used giant icebreakers
to get ships into port,</i> <i>but it's no longer possible</i> <i>to keep up
with the deep freeze,</i> <i>and the vital transportation
hub shuts down.</i> <i>♪ ♪</i> <i>Delivery of food
and other resources</i> <i>grinds to a halt.</i> <i>People suffering from cold
weather afflictions</i> <i>like pneumonia
and frostbite</i> <i>begin to overrun hospitals.</i> - Frostbite is the physical
freezing of your tissue to the point where it can
no longer sustain itself, and then it rots. <i>And then it gets to a point</i> <i>where the skin begins
to turn black,</i> <i>and the only thing you can do
to save it from spreading</i> <i>is to cut your fingers off,</i> or you can wait, and they'll fall off
themselves. <i>♪ ♪</i> <i>narrator: While Hamburg
and other cities</i> <i>in northern Europe freeze...</i> <i>♪ ♪</i> <i>in the southern
United States</i> <i>it's a completely
different scene,</i> <i>a deadly heat wave.</i> <i>Over time the stalled
ocean currents</i> <i>have warmed the atmosphere</i> <i>and driven away
the rain belt,</i> <i>creating a severe drought.</i> <i>Smoke now fills the skies
above the Texas panhandle</i> <i>as the surrounding
dried-up corn fields</i> <i>become a vast tinderbox
for wildfires.</i> - The decrease
in atmospheric moisture creates much drier conditions
at the surface, and you could have
large-scale fires, and that introduces
a lot of soot and a lot of material
into the atmosphere, <i>and it can be hazardous
to human health.</i> <i>♪ ♪</i> <i>narrator: People try
to evacuate to safer areas,</i> <i>but thousands become trapped as
flames and smoke engulf homes.</i> <i>♪ ♪</i> <i>- This isn't something
a large military-grade</i> <i>fire department
would be able to handle.</i> Communities will be cut off
and surrounded by flame. This isn't easily escapable. <i>You've got fire
raging across states,</i> <i>across state borders.</i> You have tornadoes
of fire forming. This is bad. <i>♪ ♪</i> <i>♪ ♪</i> <i>narrator: In ten years
nearly 1/10</i> <i>of the world's population
has perished,</i> <i>and the survivors
cling to life</i> <i>as the planet continues
to be rocked</i> <i>by widespread catastrophes.</i> <i>♪ ♪</i> <i>And now the research scientists
who first confirmed</i> <i>the shutdown of the ocean
currents in the north Atlantic</i> <i>have a new cause
for alarm.</i> <i>They take their research vessel
to the South Pole.</i> <i>The bottom of the planet
is heating up.</i> - When the conveyor belt
shuts down, the heat has to go somewhere that was going
to the north Atlantic. <i>It's going to the south.</i> <i>♪ ♪</i> <i>narrator: An enormous
set of glaciers</i> <i>is rapidly melting.</i> <i>They're part of the West
Antarctic Ice Sheet,</i> <i>a mass of ice 2 miles thick</i> <i>and as big as
the entire state of Texas.</i> <i>♪ ♪</i> - When the warm water
comes underneath these glaciers and starts to melt away
at these pinning points, it's gonna raise
global oceans. <i>♪ ♪</i> <i>narrator: Despite being
nearly 8,000 miles away,</i> <i>Miami is among
the first cities</i> <i>to feel the impact
of the rising seas.</i> <i>Most of the metropolitan area</i> <i>is only 6 feet
above sea level.</i> <i>On the streets people
are forced to walk knee-deep</i> <i>in polluted salt water</i> <i>and then return to their homes
that have been flooded.</i> <i>♪ ♪</i> <i>New Orleans, New York,</i> <i>and Boston are in
equally dire straits.</i> <i>With so many places
becoming uninhabitable,</i> <i>is there anywhere
left on Earth</i> <i>to escape this disaster?</i> <i>narrator: Ocean currents
control the climate</i> <i>around the world</i> <i>by regulating heat
and rainfall.</i> <i>If they ever stop moving,</i> <i>scientists predict decades
of cataclysmic weather events</i> <i>that will threaten
our very existence.</i> <i>Could you survive?</i> <i>[dramatic music]</i> <i>15 years after the shutdown
of the global ocean currents,</i> <i>nearly half a billion
people are dead.</i> <i>For survivors everywhere,
it's a constant battle</i> <i>against storms,
starvation, and disease.</i> <i>And there's no end in sight.</i> <i>♪ ♪</i> <i>- This is a change that
is not gonna stop</i> after weeks or months
or years. This is something
that is decades to centuries worth
of changes. <i>♪ ♪</i> - This is a global
climactic shift that is almost too much
to survive. <i>♪ ♪</i> <i>narrator: In
the American Southwest</i> <i>a severe drought
has ravaged the area.</i> <i>Fire departments can no longer
contain the wildfires</i> <i>that continue to burn
through cities...</i> <i>and states.</i> <i>♪ ♪</i> <i>Another victim
is the Colorado River.</i> <i>It once was the lifeblood
of the region,</i> <i>supplying hydroelectric power</i> <i>and providing water
for millions of people.</i> <i>Now it's running dry.</i> <i>- If there's no snow pack
and no rainfall,</i> the Colorado River
starts to dry up. The Colorado River also
has a hydroelectric dam. <i>The human condition
is dependent on things</i> <i>like electricity
and water.</i> You take one of those away
and things fall apart. <i>narrator: Without water,
crops and cattle</i> <i>have long since died off,</i> <i>and people are struggling
to hang on.</i> - With a lower percentage
of the Earth's land area receiving ample amounts
of rain, you have starvation
on the very short horizon. <i>♪ ♪</i> <i>narrator: The United States
isn't the only country</i> <i>reeling from the effects
of the endless drought.</i> <i>On the other side
of the world,</i> <i>without the annual
monsoon rains,</i> <i>India's ground water
reserves drain down to zero.</i> <i>♪ ♪</i> <i>A human will die
after three days without water,</i> <i>so it's a resource
worth fighting for.</i> <i>- The significant changes
in climate</i> are going to
inevitably lead to wars and battles as people
are struggling to possess <i>more precious resources...</i> - [shouting in foreign language] - Or expand their territory in order to feed
their populations. <i>[dramatic music]</i> <i>♪ ♪</i> <i>- When food is scarce,
societies tend to come apart.</i> <i>♪ ♪</i> People can't get food. They rebel quite often. <i>narrator: While an endless
drought is driving</i> <i>the population of India
to the brink of starvation...</i> <i>♪ ♪</i> <i>3,500 miles away the people
of northern Europe</i> <i>are losing their battle
with the endless cold.</i> <i>- You have concrete.
You have roads.</i> <i>You have buildings, pipes,</i> all of these things
that will just slowly corrode. <i>The weight of the snow
over so long</i> <i>can destroy even
the most robust building.</i> <i>♪ ♪</i> <i>narrator: The former head
of Hamburg's Port Authority</i> <i>and his family</i> <i>are just a few
of the millions</i> <i>migrating to southern Spain
and Greece</i> <i>in search
of warmer temperatures.</i> <i>As people seek refuge,</i> <i>there's also a mass exodus
in Brazil, India,</i> <i>and the northeastern
United States.</i> - Once we start
to have mass migrations, this means that governments
will begin to collapse. <i>We could have total chaos
like we already see</i> <i>in certain parts
of the world.</i> - You can't just take an entire
population of a country and drop them somewhere
and go, "Nope,
we're going to be fine." <i>The planet
will slowly squeeze us</i> into pockets of instability and then kill us. <i>narrator: Will
the climate refugees survive,</i> <i>or are they leaving
behind one disaster</i> <i>only to face another?</i> <i>narrator: The shutdown of
the global ocean conveyor belt</i> <i>has stopped the ocean currents
from flowing,</i> <i>causing an extreme cooling
of the north Atlantic</i> <i>and a warming effect
in the world's southern oceans,</i> <i>setting in motion a cascade
of disasters across the world.</i> <i>Is there any safe place
left on Earth?</i> <i>[dramatic music]</i> <i>♪ ♪</i> <i>Across the globe,
hundreds of millions</i> <i>of people flee their homes
in search of food,</i> <i>water,
and a livable climate.</i> <i>It's a mass migration
of climate refugees</i> <i>that's unparalleled in history.</i> - We're talking entire nations
or entire continents that might be forced to migrate
from one location to another. How do we handle
such a significant change <i>in where people live?</i> <i>How do we feed them?
How do we shelter them?</i> <i>♪ ♪</i> <i>narrator: The crisis cuts
across boundaries</i> <i>of class and wealth.</i> <i>♪ ♪</i> <i>A man who once ran one of the
largest ports in Europe...</i> <i>♪ ♪</i> <i>dies as a ragged refugee
thousands of miles</i> <i>from his home.</i> <i>♪ ♪</i> <i>♪ ♪</i> <i>narrator: As the death toll
mounts worldwide,</i> <i>another disaster is brewing
in the South Pole.</i> <i>A buildup of heat
in the southern ocean</i> <i>has been eating away
at the glaciers</i> <i>that are part of the West
Antarctic Ice Sheet.</i> <i>As they rapidly melt,
sea levels rise,</i> <i>and now every coastal city
in the world is under threat.</i> <i>♪ ♪</i> - Year after year
after year the water is getting closer
to my front door, until finally the water
is inside your home. <i>♪ ♪</i> <i>narrator: In the U.S.
a storm surge</i> <i>is approaching Miami.</i> <i>It's high tide
and a full moon,</i> <i>exactly the same conditions
as when super storm Sandy</i> <i>struck the eastern seaboard
in 2012.</i> <i>♪ ♪</i> <i>But now even regular tides
are over 4 feet higher</i> <i>because of the rise
in sea levels.</i> <i>♪ ♪</i> <i>It's the worst night
in Miami's history.</i> <i>♪ ♪</i> <i>On the streets</i> <i>people are overtaken
by the churning seawater.</i> <i>♪ ♪</i> <i>Some find temporary refuge...</i> <i>♪ ♪</i> <i>but with the entire city
in crisis,</i> <i>emergency crews
can't reach them all.</i> <i>♪ ♪</i> <i>Many who escape drowning</i> <i>will die of hunger and lack
of drinking water.</i> <i>Others will never be found.</i> <i>♪ ♪</i> <i>- Any kind of coastal city
will have a massive problem</i> <i>if there's sea level rise.</i> If you don't have
the infrastructure in place
to begin combating that, <i>it will just keep coming.</i> <i>Smart people would move
out of those cities.</i> You have to adapt or die. <i>♪ ♪</i> <i>narrator: From Miami
to Rio and London,</i> <i>as sea levels continue
to rise across the world,</i> <i>humanity will be put
to the ultimate test.</i> <i>The next wave of destruction</i> <i>could mark the end
of modern civilization.</i> <i>narrator: It's the year 2101.</i> <i>Global ocean currents,</i> <i>which help regulate
temperatures around the world,</i> <i>have long since shut down,</i> <i>unleashing over eight
decades of violent</i> <i>and cataclysmic
weather events</i> <i>that have changed
the course of history.</i> <i>Is there any chance of survival
for the future generations?</i> <i>Can we adapt, or is
mankind's fate sealed?</i> <i>[dramatic music]</i> <i>♪ ♪</i> <i>In almost every corner
of the world,</i> <i>humanity is barely hanging on</i> <i>through the worst
climate crisis</i> <i>since the dawn
of civilization.</i> <i>Famine and natural disasters</i> <i>have killed nearly
2 billion people.</i> <i>♪ ♪</i> <i>Mass migrations
are igniting civil wars.</i> <i>♪ ♪</i> - It is the end of the world
as we know it. <i>♪ ♪</i> <i>narrator:
And the global catastrophe</i> <i>continues to unfold
in west Antarctica,</i> <i>where massive glaciers</i> <i>are rapidly melting
into the ocean.</i> <i>♪ ♪</i> <i>Sea levels are now over
7 feet higher than normal,</i> <i>and they continue to rise.</i> - Every coastal city
on the planet will be experiencing sea level
rises of this magnitude. <i>♪ ♪</i> - The coastlines
of the world have to be
rewritten and redrawn. <i>- Amsterdam would be gone.</i> Venice would be gone. These cities
would not exist anymore other than in postcards and if you liked
scuba diving. <i>♪ ♪</i> <i>narrator: Miami, Florida,</i> <i>which has already been
beaten and battered</i> <i>by titanic super storms,</i> <i>now vanishes
into the Atlantic Ocean,</i> <i>along with most of the
southeastern part of the state.</i> <i>♪ ♪</i> <i>The entire northeastern
seaboard of the U.S.</i> <i>is forever changed.</i> <i>New York is now the Venice
of the 22nd century.</i> <i>Lower Manhattan has been
transformed into canals</i> <i>where water taxis
transport the rich</i> <i>to walled-off buildings
with entrances</i> <i>safely above
the rising tides.</i> <i>♪ ♪</i> <i>narrator: Over 200 miles
to the north in Boston...</i> <i>♪ ♪</i> <i>baseball games become
a symbol of defiance,</i> <i>proof that life goes on
in spite of climate change,</i> <i>so the bleachers at Fenway Park
are still packed,</i> <i>but the famous ballpark,</i> <i>once over 1/2 mile
from the water's edge,</i> <i>is now a riverfront stadium
due to sea level rise.</i> <i>♪ ♪</i> <i>In the harbor, Boston tries
to defend itself</i> <i>against the swelling waters
of the Atlantic</i> <i>with levees and sea walls,</i> <i>but the city engineers
have underestimated</i> <i>just how high sea levels
will continue to rise.</i> - The ocean is not going
to put up with a sea wall <i>narrator: And so when
the most powerful Nor'easter</i> <i>in decades strikes Boston,</i> <i>the waves breach
the city's barriers.</i> <i>♪ ♪</i> <i>Millions of gallons
of water</i> <i>rush through
Boston's shoreline</i> <i>of bays, inlets,
and rivers.</i> <i>- A big storm comes along,
breaches the sea wall.</i> You've now turned a city into,
effectively, a big bowl. <i>The same wall that was there
to protect</i> <i>is now gonna keep
the water inside.</i> <i>♪ ♪</i> <i>narrator: Fenway Park
cannot hold back</i> <i>the surging sea water</i> <i>as the never-ending cycle
of apocalyptic weather</i> <i>strikes again.</i> <i>♪ ♪</i> [all screaming] <i>♪ ♪</i> <i>narrator: This frightening
view of the future,</i> <i>with our ocean currents coming
to a complete standstill,</i> <i>is based on science
from the present.</i> <i>Scientists have been warning</i> <i>that the global ocean
conveyor belt</i> <i>may be slowing down.</i> <i>For well over a century,</i> <i>the Earth has been
steadily warming.</i> <i>Experts claim 2016 was
the hottest year on record</i> <i>for the entire planet,</i> <i>but at the same time,</i> <i>there were also
record cold temperatures</i> <i>in the north Atlantic.</i> <i>This suggests that
as global warming continues</i> <i>to melt
Arctic ice into the sea,</i> <i>this fresh water is making
the cold surface currents</i> <i>less salty and dense
so that they can't sink.</i> <i>Without this natural process,</i> <i>the world's ocean currents
could eventually shut down.</i> <i>♪ ♪</i> <i>- We're seeing that right now.
That is ongoing.</i> <i>Look at the Greenland
ice sheet.</i> <i>It's not only melting more,
but it's melting faster,</i> so this is a concern because
that then would provide the large amounts
of fresh water to the north Atlantic Ocean
to cause a shutdown. <i>♪ ♪</i> <i>- To halt or slow down
the global ocean conveyor belt,</i> the magnitude of something
like this occurring is a game-changer
for the entire planet. It's so much energy, so massive of a change, humans will have
to adapt to survive. They will not be
able to change to make things back
to where they were. <i>♪ ♪</i> <i>- This isn't some
far-flung fictional thing.</i> A climate catastrophe is
what we are facing right now. <i>♪ ♪</i> <i>And unless we do something soon</i> <i>to prolong our way of life,</i> we have to begin
to evolve or die. <i>♪ ♪</i> - With sea level rise it's not
a question of if it will happen. It's almost certainly
a question of when.
