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(Narrator) Stopping some
of the largest wildfires
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comes down to the fire line.
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(Mike) So I'm trying to separate the fire
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from the fuel that it's burning.
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So by creating this dirt path,
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I'm actually stopping
the forward progress of the fire.
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(Narrator) Wildfire seasons
are starting earlier
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and lasting much longer
than usual in the US.
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It feels challenging because
these fires are very large
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and resources are stretched thin.
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(Narrator) Oregon's Bootleg Fire
has burned through an area
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more than double
the size of New York City,
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and firefighters are working
long hours to put it out.
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(Mike) We've got to have people
or bulldozers on the ground
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to stop the spread of the flames.
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(Narrator) We followed them for a day
to see what it's like.
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Nearly 2,000 people
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are working to contain the Bootleg Fire.
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Crews from New Mexico,
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the Oregon National Guard,
and Alaska are all here.
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(Mike) Your day starts at about 5 a.m,
and you find out
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what your assignment is for the day,
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and then it usually involves
a long drive to your division.
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Constructing direct fire line
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is the best way to stop
a fire from advancing.
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And this is a low-intensity
burn through pine needles,
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but it looks like it's pretty thick.
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(Narrator) The fire here may seem mild,
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but if little pockets of
vegetation are left burning,
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the flames can expand
in unpredictable ways.
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(Mike) And we can see
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how it's stopping the spread
of the fire right here
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because there's nothing
left for it to consume
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once it hits this dirt fire line.
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Depending on what type
of firefighter you are,
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your day would consist
of about 12 to 14 hours
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of doing that.
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Here's an area that would
require a lot more attention.
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This is a dead and downed tree stump,
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so you can see
the fire's going to consume that
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and probably stay burning
for many hours, maybe days.
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So this would require water
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or just a nice fire line around it
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and letting it burn out by itself.
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(Narrator) But some parts of the forest
can still be salvaged.
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There's not a lot of slashed
or fallen trees
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on the ground here,
so there's not ladder fuels
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to carry the fire into the tree tops.
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So these trees are going to survive.
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Most of them are going to survive this.
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(Narrator) Mike also
has a plan for survival,
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since the change in winds
could make flame spread more quickly.
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(Mike) I need to have
my escape routes in place.
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And at this time, my escape route
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is back down this short piece
of fire line to the road.
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I'm in my 33rd fire season.
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I'm 54 years old.
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So I've fought probably more than 300,
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350 fires or so.
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(Narrator) The Bootleg Fire
has been burning since July
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and isn't expected to be
contained until October.
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But this land will take
much longer than that to recover.
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Kind of looks like a graveyard
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of big trees and little trees.
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Those were tall trees
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that just burned down to
toothpicks, basically.
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But it was obviously very windy
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and was driven through the treetops
from top to bottom.
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The embers from the pine
needles and the branches,
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they're just flying for probably
a quarter-mile, half-mile,
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and starting fires ahead.
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So that in turn feeds
the fire that's coming.
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So it's just,
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it's like leapfrog at that point.
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You know, once they get
a lot of rain here,
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growth will begin.
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It already is.
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But it's going to take some
decades for those to come back.
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(Producer) So how do we contain a fire
like the Bootleg Fire?
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One foot at a time.