All language subtitles for Deep.State.S01E01.Old.Habits.1080p.AMZN.WEB-DL.DDP5.1.H.264-NTb

This has got potential

for a major incident.

A wildfire races toward
a sleeping California town.

Right now, guys,
Paradise is on effin' fire.

Residents awaken to a nightmare.

I don't want to die here.

Scientists speed
toward the danger zone...

Yes, that's a scan we want.

Risking it all to
unlock the mysteries of fire.

It's not something
that you can just observe it

and figure out how it works.

Paradise is lost.

We have witnessed
literally an entire community gone.

It's the worst
fire in a season of worsts.

But why?

A history of mismanagement.

Everywhere,
foresters were trying

to do the same, silly thing.

A warming climate.

I think we're
moving into uncharted territory.

And a building
boom in the forest.

We're literally putting homes
in the line of fire.

The stakes... and
the flames... grow higher.

Right now, I'm wondering
if we're in a good spot.

"Inside the Megafire,"

right now, on "NOVA."

Major funding for "NOVA"
is provided by the following:

Major funding for "NOVA"
is provided by the following:

Another sunny day

in the Sierra Nevada Mountains
north of Sacramento.

November 8, 2018.

Skies are
clear over Northern California today,

but it is going to be a very
dangerous day for fire danger.

It's been more than 200 days

since there was any rain
worth measuring.

The forest is bone-dry.

And now the wind season
has arrived...

With a vengeance.

The strongest winds are expected
across the Sierra,

where gusts could reach
60 miles an hour.

The stage is set for disaster.

Then, 85 miles north
of Sacramento,

in a tiny hamlet called Pulga,

the wind blows a high-voltage
power line off a tower

near the Camp Creek.

Sparks fly.

In 15 minutes, the first reports
of fire come in.

It is 6:30 in the morning.

The Camp Fire has just begun.

When first responders arrive,

the flames are already
so fierce,

and the winds so strong,

they have trouble getting close
to the fire.

Eyes on the vegetation fire.

It's going to be very difficult
to access.

Camp Creek Road is nearly inaccessible.
WEBVTT 00:00:00.000.

Camp Creek Road
is nearly inaccessible.

It's got about a 35-mile-an-hour
sustained wind on it.

It's moving incredibly fast,

with a speed that stuns
even veteran firefighters.

This has
got potential for a major incident.

By 7:30, authorities
issue an evacuation order for Pulga,

where the fire funnels
up a canyon,

picks up speed,
and explodes out over the rim.

The fire is now burning
an acre of forest every second.

Firefighters cannot fight
the flames.

Instead, they focus
on rescuing residents.

In Pulga,
it's already crossing that area,

heading towards the Concow area.

The fire consumes
the small community of Concow

and heads toward
Paradise, California,

where residents have
just received immediate orders

to evacuate.

This fire starts,

and within minutes,
it's hundreds of acres.

The man in charge of the
state's wildfire fighting force,

Cal Fire,

is Ken Pimlott.

He's never seen
anything like it.

Within an hour, it is
in the town of Paradise.

Paradise.

Nestled in the woods
high in the Sierra.

A close-knit community
of 26,000,

many of them retirees drawn
to the charm and beauty

of life
in a small mountain town.

But along with it
comes a looming vulnerability

about to be made
hellishly evident

by the firestorm
stampeding toward them.

Right now, guys,
Paradise is on effin' fire.

I'm just going
to get the out of Dodge.

This is getting heavy.

Residents attempt to flee...

Everything is burning.

My God, I mean everything.

Forced to run
a gauntlet through flame.

There are only four roads
that lead off the mountain,

and all of them are perilous.

Come on!

Just go!

Chaos captured in
harrowing cell phone videos.

My God, there's fire everywhere.

I don't want to die here.

I don't want to die.

A tense escape from hell.

I'm scared!

It's Armageddon.

It's so hot.

Keep going!

HART Holy!

People are leaving their cars.

My God. It's okay.

What should we do?

We got to get out of here.

First responders race

to rescue hundreds of people
trapped in their homes...

Are they coming for us?

Come on.

Watch out! Watch out!

Jess!

Cars...

Be
Advised, on Clark Road at Skyway,

there's a woman in labor,
she's in a beige Honda Pilot.

She's going to be honking
her horn.

We have
to get this traffic moving, now!

Even a hospital. WEBVTT
00:00:00.000.

Even a hospital.

All patients
now out of Feather River Hospital.

All patients out and en route.

Go get 'em, boys.

Be safe.

It's now 9:30.

Just to the north,

in the neighboring community
of Magalia,

George Gold would normally be up
by now,

but today he sleeps in.

What woke me up was the wind.

We often have wind here;
I think, "How nice."

I open the door, and it's windy.

I look up, and it's dark.

I thought, "It's going to rain."

I smell the smoke.

I said,
"It's not going to rain."

I get dressed, I go outside,
I look around.

At that point,
the street wasn't burning.

But I could see fire,

and I thought,
"This is the real thing."

He's lived here for 11 years,

drawn by the quiet
and the beauty.

It is his dream home
for retirement.

Now he must leave it all behind
in a hurry.

Please, get out of town.

And as you're going out of town,
please be careful...

But the roads are
clogged with traffic and obstacles,

downed power lines, and trees.

Crews are racing
to clear the way.

So George decides to wait.

He drives his prized convertible
to a nearby parking lot,

hoping it will be safe there.

He records these images

as the fire closes in
on his community.

You know, you stand
here, and you just look around,

and the next thing, I see that
the high school is on fire,

and it is just going up.

Just after noon,

the fire is still raging.

Many of George's neighbors
are gathering

in another parking lot,

wondering if they are safe.

I couldn't get in at 9:00.

John Roberson
has lived here eight years.

Now, this is kind of spooky.

So that's what I'm looking at.

As you can see,
that's black smoke.

Our home right now is safe.

If it jumps up here to
South Park Circle and Andover,

it's gone.

Nearby,

Mike and Alice Nutt are packing
whatever they can fit

in their cars.

I got soda,

blankets, pillows, food,
my animals.

My dogs.

They're my babies.

And then, I'm, I'm just scared,
I am very scared.

We got our cars loaded up,
don't know where to go.

6:00 p.m.,

less than 12 hours
since it began,

and yet so much damage,

so many lives changed forever.

My God, half of our town is gone. WEBVTT
00:00:00.000.

My God,
half of our town is gone.

55,000 acres burned;

At least 1,000 structures
destroyed.

The Nutts' house?

Gone.

And so is the Robersons'.

George Gold is mesmerized

by what is unfolding
before his eyes,

but now he knows
it's time to get out.

He decides to check
on his house.

When I came down here,
everything was still burning.

So I came here, turned around,

I shot a couple of pictures,
and I took off.

But the house was already
completely engulfed in fire.

There is no hope
for Magalia or Paradise.

And the Camp Fire keeps growing.

While George is driving
toward safety,

meteorologist Craig Clements
is headed

in the opposite direction.

He and his team
are on an urgent mission

to shed some light
on how wildfires spread.

Look at that... beautiful.

Yes, that's a scan we want.

It's dangerous work.

But the risk comes
with the possibility

of a big scientific payoff.

That's interesting,

we're coming
into some smoke here.

Perfect, perfect, perfect.

They are driving
a one-of-a-kind custom rig.

They hope to peer into the fire

in a way
that no one else has before.

We need to better
understand fire spread,

and the meteorological data
is one of the key components.

And yet we never measure things
on an active wildfire.

We usually use a satellite.

We see plumes in the radar,
which is great, but, you know,

we're not really seeing
what's going on right here.

Plumes...

The columns of smoke and gas
that rise from the flames...

Are more than a sign of fire.

They also create
their own weather.

And Craig suspects that
they actively spread the fire.

But how?

To understand,
he aims a sophisticated lidar

right at the plume.

Lidar is like radar
that uses a laser beam.

It bounces off
the smoke particulates

as they are propelled
by the wind

in and around the plume

and returns information
about speed and direction.

We've been able to slice
through a plume with our lidar.

And we've been able
to measure rotation

and the wind field associated
with a rotating column,

and so that's pretty exciting.

The plumes at fires like
these are complicated systems.

As hot air rises,
cooler air rushes in.

It's called fire-induced wind.

We don't know

how that fire-induced wind
from the plume interacts

with pushing the fire front.

If the plume goes up, WEBVTT
00:00:00.000.

If the plume goes up,

does any air or smoke
come back down?

And if it does come back down,

can that spread the fire
in different directions?

It's these interactions

that we call
fire-atmosphere interactions,

and we don't have a great handle

on how they propagate
fire spread.

The Camp Fire continues
to spread without slowing down.

Cal Fire says
the town of Paradise

is pretty much destroyed.

48 hours after it began,

it has burned
more than 100,000 acres...

A grim milestone.

It is now officially
a "megafire."

Eventually, 86 lives are lost,

nearly 19,000 structures
destroyed

in the most destructive fire
in California history.

It stands apart,
but it is not an isolated event.

One year earlier,

the second-most
destructive fire, Tubbs,

burned
more than 5,600 structures

and killed 22.

Little more than three months
before Paradise is destroyed,

the Carr megafire devoured
a quarter-million acres

and a thousand homes

in and around Redding.

Eight people perished.

And on the same day
the Camp Fire began,

the Woolsey Fire started

in Los Angeles
and Ventura Counties.

It burned 97,000 acres,
killing three.

Of the ten most destructive
fires in California history,

six occurred in the 13 months
prior to the Camp Fire.

We are doing everything we
can to respond and protect citizens,

but fire is part
of the landscape in California.

This is the normal now.

And it's not just California.

Across the U.S.,

an area larger than the state
of Maryland burned in 2018.

In the last 40 years or
so, the amount of forest that burns

in any given year
in the Western United States

has increased by about 1,000%.

That means

there's about ten times
more forest burning this year

than there was in a year
in the 1970s or 1980s.

All over the world,

wildfires are bigger,
more frequent,

and more destructive.

In July 2018, fires killed
nearly 100 in Greece.

In Sweden, fires burned
above the Arctic Circle

in the midst
of an unusual heat wave.

And huge fires burned in Canada,
Russia, and Australia.

Why are we living
in an age of megafires?

The big question is,

"Are these giant, destructive megafires
we're seeing today 00:00:00.000.

"Are these giant, destructive
megafires we're seeing today

"just the way forests burn,

"or is this somehow a new normal

"that we've created
by our own actions,

forest management,
and climate change?"

Near Paradise,

firefighters have more pressing
questions on their minds.

Like how best to stop a fire
driven by fierce wind

and steep terrain...

A major factor
in its relentless spread.

Researchers are studying this

at the
U.S. Department of Agriculture's.

Missoula Fire Sciences
Laboratory.

If you are going to do
fire research,

this is the place to do it.

This entire building is devoted
to fire.

It's actually
a pretty complex phenomenon.

It's not something
that you can just observe it

and figure out how it works.

Forest Service
scientist Mark Finney

showed us how they unlock
the mysteries of fire.

So this is the burn chamber
right here.

Everything we do in here

is designed to look
at how fires behave.

On this day,

he and a dozen of his colleagues
are preparing for a test

on a large, tilting burn bed
of precisely cut cardboard.

What we can do is
put these on the burn bed

in any kind of density
that we'd like

to engineer whatever kind
of fire we'd like...

How long we want it to burn,

how long the flames are,
how fast it spreads.

The burn table
brims with instruments

that measure pressure
and temperature,

taking samples 500 times
a second.

And there are cameras
everywhere.

Today, they are trying
to understand more

about how a fire spreads uphill,
as it did near Paradise.

Okay, go ahead.

Line of fire, guys, good line.

Okay.

The flames are the visible sign

of rapid oxidation, or fire.

Fire requires dry, flammable
material, or fuel,

oxygen,

and a heat source to create
this chemical chain reaction.

Wildfires add
two additional elements...

Weather and topography...

That determine how the flames

will grow and spread.

The reason we're measuring this

is that you can actually
get fires

to accelerate extremely quickly
going uphill.

Unlike the
humans that fight them,

wildfires move much faster
uphill.

When you have a slope,

you can't get air in
from the uphill side

as easily as you can get it in
from the downhill side.

If the slope
is sufficiently steep,

all of the air is coming in
from the downhill side.

With air fanning the fire

exclusively
on the downhill side,

the flames get pushed
into the slope,

putting them in contact
with more fuel.

The tilted, climbing fire transfers
a lot of heat WEBVTT 00:00:00.000.

The tilted, climbing fire
transfers a lot of heat

to the trees and brush
ahead of the flames,

preheating and drying them,
making them more combustible.

You get very,
very effective heat transfer

and a much faster-spreading
fire.

This is what happened
when the Camp Fire started.

The wind funneled the flames
into a steep canyon,

and they rapidly accelerated
uphill,

right toward Paradise.

On the morning
after Paradise is lost,

the Camp Fire
is still spreading.

Time for firefighters to report
for the daily briefing.

Here.

Here.

Here.

All right, good morning,
everybody.

I got 7:00, we're going
to go ahead and get started

with the operational briefing.

Thousands of
firefighters are here,

and more are on the way.

Okay, up here in Cresta area,

the fire has progressed
to the east.

It's on both sides of the river,

continuing to eat its way
downcanyon.

Good morning, everyone.

Incident meteorologist Alex Hoon

is worried
about what lies ahead.

There's going to be
a lot of shifting winds,

very dry conditions.

Use your lookouts,
use your communication,

make it a safe day.

He taps into
a suite of instruments

on the ground, in aircraft,
and in space.

Orbiting 22,000 miles
above the Earth,

the two-year-old
GOES-16 weather satellite

captured visible and
infrared images of the Camp Fire

from the beginning,

the big picture of a big fire,

an eerily remote vantage point

to utter chaos, death,
and destruction.

This particular image,

it covers a time period

from about 6:00 a.m.
in the morning

all the way
until about 5:00 p.m.

when the sun begins to go down.

Within that 11 hours,
we estimate,

it went from zero
to about 50,000 acres.

And then the following 12 hours,
it grew another 40,000 acres.

It released just
an exponential amount of energy.

And that's
what we're seeing here

on the satellite image.

A big factor in the
exponential spread of the Camp Megafire:

Spotting.

Hot embers,
also called firebrands,

launched and carried
by 50-mile-an-hour winds,

landed as much as a mile ahead
of the fire front.

New spot fires started again
and again,

rapidly, randomly.

But exactly how spotting fuels
the growth of megafires

is one of the big unknowns
in wildfire science.

So it's still blowing
northeasterly.

Craig Clements hopes his
work might lead to some answers.

This is a real
strong low-level jet

coming down off the mountains.

Right now,

wildfire prediction models are not
sophisticated enough 00:00:00.000

wildfire prediction models
are not sophisticated enough

to factor in
all of the complexities

of the atmosphere and terrain.

And they don't account
for spotting at all.

We are trying to forecast

how many spot fires
there will be,

and that's something
no model right now can handle.

Better models
would help right now

to keep firefighters safe
as they battle the Camp Fire.

But for people in Paradise,

there was no time
for predictions.

Having gone through Paradise,

words don't describe it.

I mean, it, um...

A lot like the road to Baghdad
during the first Gulf War,

when vehicles were abandoned...

That's literally
what it looked like.

And we know some people perished
on those roads,

and what those people went
through,

and they really had no warning.

I think this is the first time

we've ever seen an entire town
in California

wiped off the map
by a wildland fire.

We have witnessed literally
an entire community gone.

The megafire that
wiped Paradise off the map

is more than just
a big wildfire.

At this scale,
the physics of fire changes,

greatly increasing
the intensity.

But why?

At the Missoula
Fire Sciences Laboratory,

mechanical engineer
Sara McAllister

is seeking an answer.

When you have
a really wide plume,

you're not pulling in air
into the plume

as effectively as you are
if it's a much smaller diameter.

In any fire,

colder air flows in
to replace hot air as it rises.

Most of the time,

the air can come in
from almost any direction,

chaotically.

It's what makes flames flicker
and dance.

But the flames at the center
of a megafire

are not fed by colder air
from the sides or from above...

The surrounding fire and plume
stand in the way.

So the only source of air for
these flames is at ground level.

When that happens,
the plume changes.

Sara McAllister conducts
an experiment

to simulate that restriction
of air from the side

using something you might find
in your own home:

A chimney.

We were wondering,

"Does that restriction in air

influence the burning
of the fuel underneath it?"

The idea is that
we are scaling big-fire behavior

into a small-fire, lab-based
experiment

and trying to understand
what's different.

She douses
a uniform bed of fuel,

in this case wood blocks...

Smells good, doesn't it?

With isopropyl alcohol.

Burns very nicely. WEBVTT
00:00:00.000.

Burns very nicely.

In the open, the flames are
about five feet high,

as the air streams in
from all directions.

Now watch what happens

when she slides the burning wood
underneath the chimney,

blocking sideways air flow.

So we're looking at
15-, maybe 16-foot flame heights

off of a fuel bed.

Quite the increase.

There's a feedback.

When the fires get big,

all of that air
that can't come into that plume

has to come in on the ground,

which is basically
just stoking your fire.

The chimney effect
created by giant plumes

makes megafires grow bigger,
which further fans the flames.

It's a frightening feedback loop
that gets even scarier

when a plume becomes
a fire whirl.

Fire whirls that
form on your average fire,

you see them for a few seconds,
and they're gone.

And normally,
they don't prompt too much concern.

But the biggest ones,
literally fire tornadoes,

cannot be ignored.

Scientists used to think
they were rare, even unlikely.

But as megafires become
more common,

that is no longer the case.

Three months
before the Camp Fire,

this is what happens
in Redding, California.

The Carr Megafire spawns
a deadly fire tornado

that generates winds
approaching 165 miles an hour.

But what causes the flames
to start spinning?

Wow.

This here is a
fire whirl generator.

It's an apparatus that allows us
to study how fire whirls form

and the structure of the vortex

that's produced
inside the whirl.

Mark Finney says they
begin with turbulent, strong winds

that send a lopsided current
of air into the flames.

He demonstrates
what happens next.

You'll notice at the beginning

that the flames
are very disorganized.

But as the inflow
begins to come in

in a swirling fashion,

the flames themselves
become quite organized.

The air streams in
faster and faster from the bottom,

fanning the flames,
strengthening the whirl.

The burning rate of the fuel
increases

by three to eight times
as the whirl begins to develop.

The fire tornado in Redding

develops after the wind starts
blowing inland from the Pacific.

When it collides with the fire,

it creates powerful,
swirling winds.

All the ingredients
of an epic fire tornado

are now in place.

This was ranked as an
E.F.-3, Enhanced Fujita scale tornado.

I believe this is the strongest
documented fire-induced tornado.

Temperatures reach 2,700 degrees
Fahrenheit, 00:00:00.000.

Temperatures reach
2,700 degrees Fahrenheit,

hot enough to melt steel.

It lasts for 30 minutes.

We saw things like
pipes wrapped around trees,

flipped-over cars,

power lines that were broken off

from 90-foot towers
that were taken down.

The winds to do that
are extreme.

A word redefined by megafires

as they grow in size, frequency,
and impact.

But the destruction they create

makes it easy to overlook
an important point:

Fire is an essential part
of a natural cycle

that keeps a forest healthy.

What fire does is,

it essentially releases
nutrients, precious nutrients,

into the ground

so that new plants
can grow and thrive,

and it creates a cycle

where once plants grow enough,

essentially,
they are setting the system up

for a future fire.

The concerted effort
to stop that cycle of fire

began more than a century ago.

The modern fire story
in the U.S.,

wildland fire story,

begins in 1910, really.

The spring of
1910 brings severe drought

to the northern Rockies.

In April, hot coals spewed
from a chugging locomotive

spark fire in western Montana.

In short order,

there are hundreds
of small fires burning there

and in Idaho.

As spring becomes summer,

the drought persists,
the winds pick up,

and the fires grow larger.

3,000 men are
on the front lines,

trying to beat back the flames.

There was an organization,

the U.S. Forest Service,
barely five years old,

that was now charged with
dealing with these large fires.

1910 overwhelmed the system
completely.

Three-and-a-quarter million
acres in the northern Rockies,

most of it concentrated
in a two-day period

called the Big Blowup.

The Big Blowup is triggered

when hurricane-force winds turn
those smaller fires

into several giant firestorms.

They leave a path
of devastation,

charring an area
the size of Connecticut.

78 firefighters are killed.

And the history
and ecology of U.S. forests

would be forever changed.

The thinking was,

"We could have stopped
these fires.

"If we'd had more men,
more telephone lines,

"more lookout towers,

"we could have caught
those fires early

and there would not have been
a Big Blowup."

President Roosevelt's attack
on the Depression began

with his emergency conservation
project.

During the Great Depression,

Forest Service chief Ferdinand
Silcox WEBVTT 00:00:00.000.

Forest Service chief
Ferdinand Silcox

deploys New Deal workers
and money

to reshape the national forests

with roads, lookout towers,
and phone lines.

Then, in 1935,

he announces something
called the 10:00 a.m. policy.

It meant that by 10:00

the morning following
the report of a fire,

you would have that fire
controlled.

So if you found the fire
at 10:00 p.m. Tuesday night,

you would have it controlled
by 10:00 a.m. Wednesday morning.

If you failed Wednesday morning,

then you'd plan
to have it controlled

by 10:00 a.m. Thursday morning.

Washington gives
the Forest Service the money

to make the 10:00 a.m. policy
a reality.

So you develop smoke-jumpers.

You develop organized crews.

You put in trails.

"We're going beat
back the fire menace."

Over time,
the American public becomes enamored

with the heroic narrative
of smoke-jumpers and hotshots,

while being fed a steady diet

of public service announcements
from Smokey Bear.

Remember, only you can prevent
forest fires.

The message seems clear:

Forest fires are the enemy,

to be avoided or attacked
at all costs.

All of the science,

all of the officials,

are very keen to eliminate fire.

They see no purpose to it.

It's dangerous, it's a nuisance.

"We will find
a modern alternative."

But the war on fire
creates some unforeseen consequences.

With the natural cycle
interrupted,

forests become dense
with fuel for fires.

So in the 1960s and '70s,

the seeds of a new kind of
thinking begin to take root.

It was realized in 1978 or so

that we weren't going to win
by suppressing fire.

We were having more fires,

no matter how much money
we spent,

no matter how much technology
we threw at the fires.

The 10:00 a.m. policy
was abandoned

and a new fire policy
was introduced,

where fire was supposed to be
incorporated more integrally

into wildland management.

Instead of all-out war,

it is a more nuanced approach:

Prescribed burns encouraged;

Wildfires not attacked,
but managed,

allowed to burn
whenever and wherever possible.

But in the real world,

it proves much easier said
than done.

It's hard to find a place

where the new policy isn't
at odds

with a building boom
in the forest.

In August 2018, a case in point
in the Cascade Mountains,

90 miles east of Seattle.

The Cougar Creek Fire is ripping

through the Okanogan-Wenatchee
National Forest.

The area is sparsely populated,

and the fire began
with a lightning strike.

It might seem
like the perfect place

to let a fire burn. WEBVTT
00:00:00.000

to let a fire burn.

But the fire has gotten
very big, very quickly,

and it is heading
toward the small communities

nestled in the forest.

So the man in charge
really has no choice.

Morning, everybody.

He has to
draw a line in the woods

and stop the fire
from moving beyond it.

Today is going to be
a busy fire day.

So I ask that mentally
we be there

and be ready for that.

Noel Livingston is
a veteran incident commander

for the U.S. Forest Service.

He first started fighting fires
36 years ago.

How do we manage
this fire problem that we have?

Because we have a fire problem.

We have landscapes
that are out of sync,

and we have people living
in those same landscapes.

The easy solution of,
"Well, let's just let it burn,"

isn't realistic.

Today, nearly 100 million
Americans have made the decision

to live in the woods,

what scientists call
the wildland-urban interface.

We love these places,

and yet we're living
with a certain amount of risk

that they will go up in flames.

We're literally putting homes
in the line of fire.

There are hundreds of thousands
of homes

that have been threatened
over the last several decades

by wildfires,

and we expect that to go up.

Every firefighter
here at Cougar Creek

knows the bitter irony:

Their success in the short term

might make the people nearby
feel safe living here

and encourage
even more building.

But it is a false sense
of security.

Each time they stop a fire
in its tracks,

fuel for the inevitable
builds up,

and fires are more likely
to become megafires.

Because we've excluded fire

for the past hundred years
or so,

particularly
in heavily wooded stands,

we're getting more of a
continuous, high-intensity event

in those types of stands.

This ups the
ante for firefighters

already doing very risky work.

As the fire grows in strength,

safety officer Jennifer Rabuck
is on a scouting mission

near the fire line.

She aims to strike a balance
between saving homes

and protecting
firefighters' lives.

This is our primary
containment line

that we're walking on.

The fire is off to our right.

Ideally,
we'd like to hold this line.

Hot embers from the wildfire,

launched and carried
by the wind,

are flying overhead, landing
in what amounts to kindling.

You look at some of this,

it's all dry and dead,

and it just flakes off
in your fingers.

There's nothing in here

that has got any sort
of resistance to take.

If an ember lands in here,

this piece of wood is going
to catch fire.

The dead,
dry wood is where spot fires start,

but not where they end.

With the temperature high and the
humidity so low, WEBVTT 00:00:00.000.

With the temperature high
and the humidity so low,

everything here is dehydrated
and highly flammable.

This is what we call
tree torching

or even group torching.

Single tree would be one,

group torching would be
pockets of trees.

When it's torching,
it starts out on the bottom.

And as those flames grow,
it's sending that heat up

into the live part of the tree,
the green part of the tree,

preheating it,

so it's more receptive
to that build-up and build-up,

and it reaches
a certain combustion point,

where the entire tree
will go up.

And you can see the ember wash
coming off of those,

and you can see how far
it's going over the ridge.

This is a living
tree that's gone up?

This is a living tree.

What goes through your mind
when you see this?

Right now I'm wondering
if we're in a good spot.

The Cougar Creek Fire
will burn more than 42,000 acres

before it stops spreading.

But no structures are damaged.

Another victory for the nation's
wildfire fighting force.

They succeed 97% of the time.

A century of excluding fire

has created some unhealthy,
dangerous forests

all over the United States.

But how best to allow forests,
fire, and people to coexist?

Fire ecologist Sharon Hood
is testing some alternatives

in western Montana.

Got the pith.

Nice.

This 30-acre plot
is part of a long-term study

to see if there's a better way
to manage our forests.

It hasn't burned in 100 years,

and it is filled with fuel
for a fire.

It's hard just to plow through,
much less do their work.

You basically
can't see through it,

and when you're trying to walk
through it,

you're weaving
through very small trees,

you're stepping
over a lot of logs.

It's the density
that strikes me.

The dead and
small trees and the shrubs

are the ingredients, the fuel,
for bigger, more intense fires.

This forest is a tinderbox...

A consequence of a misguided
forest management philosophy.

Our ponderosa pine forests

evolved
with very frequent fires...

On average, every seven years.

So removing fire for 100 years

allows all these little
seedlings to get established.

If fires were coming
through here routinely,

they would kill those seedlings,
creating open conditions.

And she has the scientific
proof in the plot next door,

where they thinned out the trees in
2001, WEBVTT 00:00:00.000

where they thinned out the trees
in 2001,

then started a prescribed burn
in 2002.

You're looking at
this open ponderosa pine forest

16 years later.

The thin-and-burn forest
is all open space.

There's not a lot of fuels,
and you see the larger trees.

Back in her lab in Missoula,

Sharon and her team carefully
slice and analyze

the core samples

from the thinned and burned
parcel.

The tree rings tell a story,
if you know how to read them.

Here we have a close-up
of a tree core,

and each light and dark band
is one year's worth of growth.

And you can see, between 1990
and 2000, in this section,

you've got narrow growth rings.

Narrow rings mean less growth,

nature's record
of how the trees were faring

before the experiment began.

And then, here in 2001,

there was a thinning, where
we cut about half the trees,

and then in 2002,
there was a prescribed burn.

And you can start seeing really
fat growth rings after that.

A forest that is more open

and trees that are larger
and healthier.

Thinning and controlled burning
clearly works.

But is it practical
beyond an experiment?

This type of treatment
that you see here is scalable.

There's no one-size-fits-all,

but thinning is a major tool
that we have

to be able to re-introduce fire
in a safer way.

It isn't the answer
in every forest landscape.

And prescribed burning faces
a lot of opposition,

ironically, from the people
most in harm's way,

worried about changing
their view

or breathing the smoke.

When we put a little
bit of smoke in the air

under prescribed fire,

sometimes it can meet a lot
of resistance from the public.

There have been
some prescribed burns

that were supposed to be
small forest treatments,

and then a gust of wind came
at the wrong time

and turned that prescribed burn
into a wildfire.

And what about the expense?

Thinning and burning can cost
about $1,000 an acre,

and it's not a one-time fix.

But compared
to the cost of a megafire,

maybe it's an ounce
of prevention.

I think by now,

people who live in the forest
or near the forest recognize

that there's going to be a fire
now

or there's going to be a fire
later,

and you can have it
under controlled conditions,

when you can go away
for the weekend,

or you can be running
for your life

watching your house burn down.

Humans have
created the megafire monster,

but enlightened
forest management alone

won't stop the infernos.

Because there is another factor
at play,

also with our fingerprint... WEBVTT
00:00:00.000

also with our fingerprint...

Climate change.

The Camp Fire has broken
records,

and yet it is only one
of three major incidents

in California right now.

We've been going

from fire to fire to fire,

and every time we see it,

it's, like,
"That, that's unbelievable.

"That's unbelievable.

I can't, can't believe
we're seeing this."

And in the
land of endless summers,

there is now
an endless fire season.

We're in November... this is...

This is not historically when we
would see fires still occurring.

It would be closer to
the hotter part of the summer,

but they're, they're lasting
into December now.

So it's, it's a fire year.

There's no fire season.

A fire year,

year after year after year.

What role do rising temperatures

and changing
precipitation patterns

play in this trend?

In California,
the record wildfires occur

after a historic
six-year drought.

Climate change

is taking a pretty bad drought

and actually causing it to be

on par with the biggest droughts
over the last millennium.

To better understand
this link between climate and fire,

paleoecologist Cathy Whitlock
spends a lot of time

in Yellowstone National Park.

It's a nearly pristine ecosystem

where we can really see
these things going on.

This is Blacktail Pond.

The layers of mud
beneath this ancient lake bed

have their own story to tell,
going way back in time.

Lakes are great repositories
of environmental information.

Pollen grains land
on the surface of the lake,

and they get buried
in the sediment.

Charcoal from fires gets carried
in the air

and then sinks to the bottom.

And those sediments
are undisturbed,

and so you get a continuous
record of environmental history.

One, two, three.

Keep it straight,
keep it vertical.

All right.

So let's pull it up.

Let it drain, turn it sideways.

Okay, now we're going
to extrude.

Here it comes.

Nice!

Whoo!

Using two types of clues,

she can learn a lot
about the ancient landscape.

Pollen tells us about
the plants that are growing here,

and the vegetation is
one of our best indicators

of what the climate was.

So we can use the pollen record
to reconstruct past climate,

and then we can compare it with
the charcoal record of fires

to see how periods of fire
relate

to periods of climate change.

The sediment at Blacktail Pond

allows Cathy to look back
15,000 years,

when the glaciers
from the last ice age retreated

from this area.

Back in her laboratory, WEBVTT
00:00:00.000.

Back in her laboratory,

Cathy slices the cores in half

and begins to take
a closer look.

There's a lot going on
at this time period in this lake.

The light-colored layers
are calcium carbonate-rich.

They probably were deposited
by algae

that were producing
this calcium carbonate,

and when that happens,

usually, it happens because
the lake's a little bit warmer.

The dark layers,

I'm seeing little blips of
what look like charcoal to me.

But I suspect there's going
to be a lot of charcoal

all the way through this core.

We just have to look
under a microscope to find it.

After they chemically treat
and sift sediment from the core,

they can clearly identify
and tally the charcoal

and the pollen.

I'm seeing
some large pine pollens.

They kind of look
like Mickey Mouse hats.

And some of them, like that one,
is a lodgepole pine, for sure.

She has documented
a long relationship

between fire and temperatures.

Over the past 7,500 years,

fire activity closely correlates
with the climate.

As temperatures cooled,

fire activity
gradually decreased.

But as humans have warmed
the planet in the last century,

fire frequency
has dramatically increased.

During the warm, dry,
windy summer of 1988,

800,000 acres,

one third of Yellowstone Park,

burned.

Her analysis shows

it was one of the largest
fire seasons here

in the past 6,000 years.

If current temperature trends
continue,

fires of that magnitude

will likely be more frequent
in the future.

I think we're moving
into uncharted territory.

We're seeing warming
at rapid rates,

we're seeing
extreme fire events.

We're seeing things that we
just haven't seen in the past,

and that's my big concern.

Cory, do you have all the vials?

Ecologist Monica
Turner has the same concern.

She and her team

study Yellowstone's breathtaking
lodgepole pine forests.

In Yellowstone,

what I do is try to understand

how fires affect the forest

and then
how the forest recovers.

The fires here in 1988

were part of the normal,
100-to-300-year burn cycle

for lodgepole pines.

Although the fires
were big and severe,

the forests of Yellowstone
recovered

in spectacular fashion.

But in 2000 and again in 2016,

new fires hit some of the
same areas that burned in '88.

Monica wonders if climate change
is making it hard

for the forest to bounce back
once again.

So that's something like
104 degrees Fahrenheit...

Whoa.

Just below the surface here.

That's hot.

Too much heat, too little shade. WEBVTT
00:00:00.000.

Too much heat, too little shade.

And what happens
when forests burn again so soon,

before there is time to recover?

To find out, they systematically
count and measure

tree seedlings.

D8 is dead.

And they determine
how far they travel.

What we are hoping
to find out here is,

"Will they germinate?

Are the conditions suitable
for them to grow?"

In this plot,

where only 16 years
separate two fires,

young trees
are completely destroyed.

Only stumps remain,

and there is on average
a 60% reduction

in the number of tree seedlings.

More frequent, more severe fires
and warmer temperatures

mean new generations of trees
will have a much harder time

taking root.

We are now questioning

how the frequency
and the severity of fires

may overcome the ability
of the forests to recover.

If we have future fires
that happen every 15 years,

I don't know.

Fire may be integral
to the evolution of forests,

but the scale and frequency
of today's megafires

appear to be something new.

The landscape is changing fast,

a symptom of climate change
that is more sudden than most.

Going into the future,

I think we're going to have
more fires.

And if we continue to have
more fires,

it will gradually shift
the composition of the forests.

In some places,
we may lose forest

and get more grassland.

The Camp Fire is still burning,

but in Paradise,
embers are starting to cool.

George Gold is headed
through town

on his way to Magalia,
just to the north.

He already knows
his house is destroyed,

but what happened
to the sports car

that he left a mile away
in a parking lot?

Finding out is his main goal
today.

There is my car!

I see my car!

It's there.

Can you believe it?

My Miata is alive.

A-ha, she lives!

It's time to see

if there's anything
worth salvaging at home.

This was my neighborhood,
and there's nothing left.

There's, there's no neighborhood
here.

There's just debris.

I mean, it was gorgeous here,
just gorgeous.

Peaceful, quiet.

My shed's there,

so I can do my gardening.

And this is my front door,
right here.

187507, 00:00:00.000.

Open the door.

I mean, I never considered
myself a materialistic person.

I mean, if you went in my house,
you would say,

"Gee, you're kind of living
a spartan life," right?

No fancy stuff,
just basic stuff.

But the stuff I had,
I loved it, right?

Every time I walked in the door,
I thought,

"Wow, this is my house.

I've made it, I'm in heaven."

And I had all these tool boxes.

You know, I spent 30 years
gathering tools.

Here we go.

They may live again.

Maybe.

I think not.

It's really hard.

I don't know what to do...
I don't know what to think.

I've never experienced
anything like this.

I don't know what to think,
I don't know what to do,

I don't know what to feel.

I don't know...
I'm no youngster anymore.

I don't know
if I'll ever recover.

Major funding for "NOVA"
is provided by the following:

To order this "NOVA" program
on DVD,

visit ShopPBS
or call 1-800-PLAY-PBS.

This program is also available
on Amazon Prime Video.