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The kitchens of today can be more beautiful,
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00:00:04,296 --> 00:00:06,423
because this year,
there's a better...
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#� Oh, what a relief it is... #�
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Charlie!
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6
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On July 5, 1946,
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00:00:47,381 --> 00:00:49,049
French designer Louis Reard
paraded a model
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00:00:49,132 --> 00:00:51,093
down a Paris runway
in a two-piece bathing suit
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that he called a bikini.
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00:00:53,095 --> 00:00:55,097
Reard spontaneously
dubbed it "bikini"
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00:00:55,180 --> 00:00:57,182
during a week in which
world headlines were occupied
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by nuclear tests conducted
by the United States of America
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00:01:00,310 --> 00:01:02,271
off the Bikini atoll
in the Pacific.
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00:01:02,354 --> 00:01:04,481
Wearing a bikini
actually created
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00:01:04,565 --> 00:01:06,108
more cries of outrage and scorn
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00:01:06,191 --> 00:01:08,986
than the act of exploding
an atomic bomb.
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00:01:12,197 --> 00:01:15,075
It's a new era
of undersea exploration,
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00:01:15,158 --> 00:01:17,744
with the self-contained
underwater breathing apparatus.
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00:01:17,828 --> 00:01:20,205
If the bikini won't get you
into the water,
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00:01:20,289 --> 00:01:22,457
perhaps the aqualung
will do the job.
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00:01:22,541 --> 00:01:25,127
Those denizens of the deep
had better watch out,
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00:01:25,210 --> 00:01:28,880
as man's dominion now extends
both above and below the waves.
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In 1946, in the waters
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00:01:35,512 --> 00:01:38,223
around the remote Pacific island
of Bikini,
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coral reefs were demolished
and pulverized
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00:01:41,226 --> 00:01:44,187
by the test explosions
of multiple nuclear bombs.
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00:01:45,689 --> 00:01:48,150
Since radioactive fallout
contaminated the island,
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00:01:48,233 --> 00:01:51,612
the reefs of Bikini were to be
left to their own devices,
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00:01:52,237 --> 00:01:55,532
with no human contact
for over 50 years.
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00:01:56,408 --> 00:02:00,370
But in that time,
something wonderful happened.
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00:02:01,705 --> 00:02:03,957
The reefs returned.
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00:02:14,217 --> 00:02:16,261
33
00:02:26,229 --> 00:02:28,273
34
00:02:38,075 --> 00:02:40,327
The reefs of Bikini
are testament
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00:02:40,410 --> 00:02:42,496
to the resilience of nature.
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00:02:43,163 --> 00:02:46,541
But the reefs of the world
now face a far greater threat.
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00:02:48,293 --> 00:02:50,837
Think of a reef as a city,
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00:02:50,921 --> 00:02:53,507
a city beneath the sea.
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00:03:03,350 --> 00:03:05,519
40
00:03:15,320 --> 00:03:17,239
41
00:03:29,334 --> 00:03:31,336
42
00:03:41,346 --> 00:03:43,348
43
00:03:53,358 --> 00:03:55,193
44
00:04:05,162 --> 00:04:07,330
45
00:04:17,174 --> 00:04:19,259
46
00:04:30,020 --> 00:04:32,189
47
00:04:41,782 --> 00:04:43,950
48
00:04:53,251 --> 00:04:55,420
49
00:04:57,714 --> 00:05:01,343
Like our cities, reefs offer
sustenance and shelter
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00:05:01,426 --> 00:05:03,094
for their diverse communities.
51
00:05:03,178 --> 00:05:06,431
They protect an incredible
variety of creatures.
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00:05:08,099 --> 00:05:11,853
But our cities are altering
the chemistry of the ocean,
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00:05:11,937 --> 00:05:15,774
the very chemistry
the reef-builders rely upon.
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00:05:21,446 --> 00:05:25,450
Coral comes in so many different
shapes and forms.
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00:05:28,161 --> 00:05:29,663
For years, people were confused
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00:05:29,746 --> 00:05:32,207
as to whether it
was a rock formation
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00:05:33,875 --> 00:05:35,168
or a plant.
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00:05:36,586 --> 00:05:39,381
In fact, coral reefs
are colonies
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00:05:39,464 --> 00:05:42,884
of thousands of tiny animals
called polyps,
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00:05:43,051 --> 00:05:46,012
each colony sharing
a communal skeleton.
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00:05:50,392 --> 00:05:54,271
Living within the coral polyp
is a kind of algae.
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00:05:56,231 --> 00:05:59,568
Like a plant, the algae absorbs
the sun's energy
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00:05:59,651 --> 00:06:02,195
and passes it on to the coral.
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00:06:02,279 --> 00:06:04,322
In this way, coral can get
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00:06:04,406 --> 00:06:08,201
as much as 90% of its energy
from sunlight.
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00:06:09,202 --> 00:06:12,414
But we need more than energy
to build our cities.
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00:06:13,582 --> 00:06:16,793
We need bricks and mortar,
stone and cement.
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00:06:19,462 --> 00:06:22,591
The reef's building blocks
are the carbon, calcium,
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00:06:22,674 --> 00:06:25,427
and other minerals
dissolved in seawater
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00:06:25,510 --> 00:06:27,596
or trapped in organic matter.
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00:06:27,679 --> 00:06:31,558
They absorb these elements
and create calcium carbonate.
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00:06:32,183 --> 00:06:36,479
It's not unlike the way we grow
our bones and fingernails.
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00:06:38,565 --> 00:06:40,859
It's an organic factory,
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00:06:41,067 --> 00:06:43,403
using the sun's energy
and carbon
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00:06:43,486 --> 00:06:45,739
to build the reef cities.
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00:06:47,324 --> 00:06:50,243
We may think our cities
diverse and well populated,
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00:06:50,535 --> 00:06:54,581
but the reefs of the world
rival tropical rain forests
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00:06:54,664 --> 00:06:57,375
for their wealth
and variety of life.
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00:06:57,459 --> 00:07:01,379
If we look closer,
we soon realize how alien,
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00:07:01,463 --> 00:07:04,466
how beautiful
these cities really are.
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00:07:14,601 --> 00:07:16,770
82
00:07:26,613 --> 00:07:28,782
83
00:07:33,036 --> 00:07:37,082
Nudibranchs,
the slugs of the sea,
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00:07:37,165 --> 00:07:39,709
are just one of an incredible
number of creatures
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00:07:39,793 --> 00:07:41,252
that depend upon the reef.
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00:07:43,046 --> 00:07:46,508
They come in an amazing array
of shapes and colors.
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00:07:48,301 --> 00:07:51,388
And they're no bigger
than your little finger.
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00:08:01,231 --> 00:08:03,400
89
00:08:13,868 --> 00:08:16,037
90
00:08:25,630 --> 00:08:27,799
91
00:08:38,518 --> 00:08:40,645
92
00:08:50,655 --> 00:08:52,407
93
00:09:00,999 --> 00:09:04,544
Flatworms have no
respiratory organs.
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00:09:04,627 --> 00:09:07,088
They absorb oxygen
and expel carbon dioxide
95
00:09:07,172 --> 00:09:09,507
by a process of diffusion,
96
00:09:09,841 --> 00:09:12,677
so their bodies are paper-thin.
97
00:09:20,727 --> 00:09:22,896
98
00:09:33,114 --> 00:09:35,283
99
00:09:42,457 --> 00:09:44,125
Elsewhere on the reef,
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00:09:44,209 --> 00:09:46,836
clownfish shelter
within the poisonous tentacles
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00:09:46,920 --> 00:09:49,130
of a giant sea anemone.
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00:09:50,215 --> 00:09:52,258
Unlike other reef fish,
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00:09:52,342 --> 00:09:54,552
they are immune
to the anemone's sting.
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00:09:55,887 --> 00:09:57,097
Away from this protection,
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00:09:57,180 --> 00:10:00,642
a clownfish might quickly
be devoured by predators.
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00:10:01,643 --> 00:10:03,686
In return, the clownfish eats
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00:10:03,770 --> 00:10:06,314
the anemone's waste
and leftovers.
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00:10:06,397 --> 00:10:09,275
And by being
fiercely territorial,
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00:10:09,359 --> 00:10:13,446
it even helps ward away
the anemone's predators.
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00:10:13,530 --> 00:10:18,034
This is one of the reef's
many examples of symbiosis,
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00:10:18,118 --> 00:10:21,621
a relationship between
two different creatures
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00:10:21,704 --> 00:10:24,499
that benefits each of them.
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00:10:32,423 --> 00:10:34,467
There are other methods
of defense on the reef,
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00:10:34,551 --> 00:10:36,136
equally creative.
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00:10:36,219 --> 00:10:38,555
Camouflage, for example.
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00:10:49,149 --> 00:10:50,483
117
00:10:51,151 --> 00:10:54,112
The crocodile fish
almost completely disappears
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00:10:54,195 --> 00:10:56,614
amongst the sand and stones
in the shallows
119
00:10:56,698 --> 00:10:59,659
as it waits for
unsuspecting prey to pass by.
120
00:11:08,459 --> 00:11:10,587
Other fish blend in
with the coral,
121
00:11:10,670 --> 00:11:12,213
like the scorpion fish,
122
00:11:13,173 --> 00:11:15,675
or hide beneath the sand.
123
00:11:25,602 --> 00:11:27,687
124
00:11:29,606 --> 00:11:31,900
Coral reefs support
over one quarter
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00:11:31,983 --> 00:11:34,444
of all the world's
marine species,
126
00:11:34,527 --> 00:11:37,530
and that includes
a vast array of mollusks.
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00:11:38,198 --> 00:11:40,533
There are more species
of mollusk
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00:11:40,825 --> 00:11:44,954
than all species of bird,
reptile, and mammal combined.
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00:11:53,796 --> 00:11:55,965
130
00:12:06,809 --> 00:12:09,646
131
00:12:18,905 --> 00:12:21,074
132
00:12:30,667 --> 00:12:32,835
133
00:12:42,679 --> 00:12:44,847
134
00:12:48,393 --> 00:12:50,186
Grooming may have become
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00:12:50,270 --> 00:12:52,021
something of a ritual
in our cities,
136
00:12:52,105 --> 00:12:53,856
but is a vital part of our lives
137
00:12:53,940 --> 00:12:56,818
as far as health and hygiene
is concerned.
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00:12:56,901 --> 00:12:59,112
We even use a form of grooming
139
00:12:59,195 --> 00:13:02,115
that directly mimics life
on the coral reef.
140
00:13:21,801 --> 00:13:24,512
Cleaning stations
attract much larger animals
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00:13:24,595 --> 00:13:27,348
to the shallow waters
of the reefs.
142
00:13:27,432 --> 00:13:29,475
Small fish operate the stations.
143
00:13:29,559 --> 00:13:30,685
They groom the larger ones
144
00:13:30,768 --> 00:13:35,732
by nibbling away parasites
or dead skin.
145
00:14:05,762 --> 00:14:09,140
146
00:14:12,560 --> 00:14:15,438
These manta rays
approach the reef at high tide,
147
00:14:15,521 --> 00:14:18,775
in search of
the cleaning station.
148
00:14:18,858 --> 00:14:23,071
It's a predictable timetable
that can attract other visitors.
149
00:14:52,934 --> 00:14:55,103
150
00:15:12,829 --> 00:15:16,749
Coral grows and builds
upon its own skeletal remains
151
00:15:17,083 --> 00:15:20,336
in whichever direction
will give it light and warmth.
152
00:15:20,420 --> 00:15:23,923
As a result, reefs can take
many different forms.
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00:15:24,006 --> 00:15:26,134
They follow coastlines.
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00:15:27,927 --> 00:15:30,388
They surround rising
or falling mountains.
155
00:15:37,019 --> 00:15:39,939
They can become atolls
around sunken peaks.
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00:15:48,865 --> 00:15:51,784
Reefs offer protection
for the islands within,
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00:15:53,411 --> 00:15:56,873
sheltering them from the ravages
of the open sea.
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00:15:59,876 --> 00:16:01,794
Throughout time,
reefs have created
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00:16:01,878 --> 00:16:04,797
these sheltering cities
beneath the sea,
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00:16:04,881 --> 00:16:08,426
in tune with the slow-moving
geology of our planet.
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00:16:09,385 --> 00:16:11,095
And they have helped shape it.
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00:16:12,763 --> 00:16:16,142
Both cities have
transformed our planet--
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00:16:16,225 --> 00:16:18,811
the reefs
over millions of years,
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00:16:18,895 --> 00:16:22,023
our cities in merely
hundreds of years.
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00:16:24,358 --> 00:16:26,819
As our cities sprawl and expand,
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00:16:26,903 --> 00:16:31,157
it's possible to see them
from space.
167
00:16:31,240 --> 00:16:35,369
But the coral cities have been
building for millions of years,
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00:16:35,453 --> 00:16:39,123
creating the largest
living structures on the planet,
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00:16:39,207 --> 00:16:42,335
also visible from space.
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00:16:46,506 --> 00:16:52,970
As sea levels change, exposed
reefs quickly turn to stone,
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00:16:53,054 --> 00:16:55,765
outcrops become rock islands,
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00:16:55,848 --> 00:17:00,436
or over time, they become
cliffs or mountains.
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00:17:01,812 --> 00:17:04,106
Limestone formations
all over the world
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00:17:04,190 --> 00:17:07,693
were mainly created
by reef-builders.
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00:17:07,777 --> 00:17:10,112
Reef limestone
even covers the exterior
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00:17:10,196 --> 00:17:12,365
of the Empire State Building.
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00:17:18,788 --> 00:17:22,333
500 miles east of
the Philippines, in Palau,
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00:17:22,416 --> 00:17:27,547
ancient reefs have created
an archipelago of rock islands.
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00:17:27,630 --> 00:17:30,299
Some of the islands
have formed marine lakes,
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00:17:30,424 --> 00:17:33,678
completely cut off
from the surrounding ocean.
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00:17:53,864 --> 00:17:56,701
The lakes have trapped
whole populations of jellyfish,
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00:17:56,784 --> 00:18:00,079
uniquely separating them
from the open sea
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00:18:00,162 --> 00:18:02,081
and their principle predators,
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00:18:02,164 --> 00:18:05,209
so they no longer need
their sting.
185
00:18:05,293 --> 00:18:09,088
They simply drift around
the lake, tracking the sun--
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00:18:09,171 --> 00:18:11,173
just as dependent
upon its energy
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00:18:11,257 --> 00:18:14,468
as their relatives on the reef,
the coral polyps.
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00:18:42,580 --> 00:18:44,749
189
00:19:13,694 --> 00:19:15,613
190
00:19:48,145 --> 00:19:52,108
Coral atolls create calm lagoons
within the circle of the reef,
191
00:19:52,191 --> 00:19:55,361
a perfect environment
for mangrove forests.
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00:19:58,489 --> 00:20:01,617
Just a few species of tree,
adapted to the high density
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00:20:01,701 --> 00:20:03,869
of salt in the warm
shallow waters,
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00:20:03,953 --> 00:20:06,122
make up these dense forests.
195
00:20:16,757 --> 00:20:21,095
Mangroves harbor nurseries
for a variety of marine life.
196
00:20:23,264 --> 00:20:26,767
Juvenile lemon sharks
shelter within the mangroves,
197
00:20:26,851 --> 00:20:29,520
where there is also
an ample supply of food,
198
00:20:30,104 --> 00:20:32,565
venturing further away
from the mangrove roots
199
00:20:32,648 --> 00:20:34,942
as they grow in size.
200
00:20:37,820 --> 00:20:40,156
So coral reefs can both protect
201
00:20:40,239 --> 00:20:43,409
and connect
different ecosystems.
202
00:20:49,248 --> 00:20:51,876
The lagoons are quite different
environments to the coral reefs,
203
00:20:51,959 --> 00:20:55,629
with their sandbanks
and sea grass.
204
00:21:17,735 --> 00:21:19,904
205
00:21:29,538 --> 00:21:32,374
When the sharks reach
12 to 15 years of age,
206
00:21:32,708 --> 00:21:35,920
they leave the mangroves
and the lagoons behind
207
00:21:36,003 --> 00:21:39,673
to assume their role in a
complex, interlocking food chain
208
00:21:39,757 --> 00:21:41,801
that connects
the creatures of the reef
209
00:21:41,884 --> 00:21:44,303
to creatures of the open sea.
210
00:21:57,316 --> 00:21:59,652
Reef fish tend to grow slowly
211
00:21:59,735 --> 00:22:02,738
and live longer
than oceanic fish,
212
00:22:02,863 --> 00:22:06,158
but their eggs are spawned
directly into the open sea,
213
00:22:06,242 --> 00:22:09,161
with a less than one percent
chance of survival,
214
00:22:09,245 --> 00:22:11,247
since they immediately
join the ranks
215
00:22:11,330 --> 00:22:15,334
of the ocean's greatest
food source: plankton.
216
00:22:20,005 --> 00:22:22,675
Plankton drifts freely
in the water,
217
00:22:22,758 --> 00:22:26,929
swept away by the currents
flowing in and around the reefs.
218
00:22:27,012 --> 00:22:29,682
It's here that
feeding stations form.
219
00:22:44,238 --> 00:22:48,284
Manta rays and huge shoals of
fish gather at these stations
220
00:22:48,367 --> 00:22:51,287
to filter the plankton
and nutrients from the water
221
00:22:51,370 --> 00:22:54,373
as it flows through the channel.
222
00:23:05,134 --> 00:23:07,720
The whale shark is one of
the largest filter feeders
223
00:23:07,803 --> 00:23:09,972
to visit the reef.
224
00:23:19,106 --> 00:23:20,316
Out beyond the reef,
225
00:23:20,399 --> 00:23:22,318
there is fierce competition
among the predators,
226
00:23:23,277 --> 00:23:25,112
and yet, they are
all still dependent
227
00:23:25,195 --> 00:23:27,197
upon the reef in some way.
228
00:23:45,507 --> 00:23:47,760
These Atlantic spotted dolphins
229
00:23:47,843 --> 00:23:51,931
use the shallows close to the
reefs as a place to rest, play,
230
00:23:52,014 --> 00:23:54,350
and to teach their young
survival tactics
231
00:23:54,433 --> 00:23:56,352
for the open sea.
232
00:24:24,463 --> 00:24:26,465
233
00:24:32,471 --> 00:24:34,723
So reefs can be seen
as a primary source
234
00:24:34,807 --> 00:24:36,976
of food in the ocean.
235
00:24:40,771 --> 00:24:44,233
They also filter
the surrounding water,
236
00:24:44,316 --> 00:24:46,527
helping keep a balance
of nutrients, minerals,
237
00:24:46,610 --> 00:24:50,990
and chemicals beneficial
to local fish populations.
238
00:24:51,073 --> 00:24:52,700
Without this filtration,
239
00:24:53,033 --> 00:24:55,995
disease can quickly spread
through the food chain.
240
00:25:23,564 --> 00:25:25,733
241
00:25:30,154 --> 00:25:32,531
In the years since
the invention of scuba,
242
00:25:32,614 --> 00:25:35,451
technology has
transformed our lives,
243
00:25:35,534 --> 00:25:38,662
but reef life has deteriorated
all over the world,
244
00:25:38,912 --> 00:25:41,040
for many different reasons.
245
00:25:41,123 --> 00:25:45,627
The pollution from our cities,
bacteria in our sewage,
246
00:25:45,711 --> 00:25:50,132
the removal of mangrove forests,
the increasing pressure
247
00:25:50,299 --> 00:25:52,676
on local people to find
new sources of income
248
00:25:52,760 --> 00:25:55,763
has led to
the dynamiting of reefs.
249
00:25:55,846 --> 00:25:58,474
Even the sun cream we use to
protect ourselves while bathing
250
00:25:58,557 --> 00:26:02,478
can have a harmful effect
on reefs.
251
00:26:02,561 --> 00:26:05,481
And then there's bleaching.
252
00:26:05,564 --> 00:26:07,483
The algae that lives
within the coral
253
00:26:07,566 --> 00:26:10,444
and is responsible for
much of the coral's energy,
254
00:26:10,527 --> 00:26:12,321
also gives coral its color.
255
00:26:12,571 --> 00:26:14,782
When sea temperatures rise,
256
00:26:14,865 --> 00:26:17,284
the algae is forced
to abandon the coral,
257
00:26:17,367 --> 00:26:20,079
taking with it
the coral's color.
258
00:26:21,705 --> 00:26:23,582
This is what is known
as "bleaching."
259
00:26:23,665 --> 00:26:27,294
Without the algae, the coral
can die of starvation.
260
00:26:32,508 --> 00:26:35,177
The impact of these
combined threats
261
00:26:35,260 --> 00:26:36,929
can be fatal for coral,
262
00:26:38,555 --> 00:26:42,184
and many reefs around the world
have already been lost.
263
00:26:44,436 --> 00:26:46,522
Reefs have so much
more to offer.
264
00:26:47,106 --> 00:26:48,941
We still have so much to learn,
265
00:26:49,024 --> 00:26:51,193
secrets to unravel.
266
00:26:53,570 --> 00:26:56,532
They are as much a potential
source of new breakthroughs
267
00:26:56,615 --> 00:27:00,452
in medical science as
the world's rain forests.
268
00:27:03,330 --> 00:27:07,918
Yet reefs are vanishing five
times faster than rain forests.
269
00:27:11,046 --> 00:27:14,591
And there is another,
much greater threat.
270
00:27:15,634 --> 00:27:19,763
At night, the light
that glows from our cities
271
00:27:19,847 --> 00:27:21,515
requires an enormous
amount of energy.
272
00:27:21,598 --> 00:27:23,976
And where energy is concerned,
273
00:27:24,059 --> 00:27:26,270
there's always a price to pay.
274
00:27:50,502 --> 00:27:54,590
Every second, we pump 761 tons
275
00:27:54,673 --> 00:27:56,592
of carbon dioxide
into the atmosphere
276
00:27:56,675 --> 00:27:59,011
in our unquenchable
thirst for energy.
277
00:28:00,304 --> 00:28:02,431
A third of that amount
278
00:28:02,514 --> 00:28:03,682
dissolves into the ocean.
279
00:28:05,851 --> 00:28:08,020
Carbon is an essential
building block of life.
280
00:28:08,103 --> 00:28:10,230
It is locked in rock,
281
00:28:10,480 --> 00:28:12,608
buried in fossils,
282
00:28:12,691 --> 00:28:15,611
circulating in the atmosphere,
283
00:28:15,694 --> 00:28:18,280
dissolved in the ocean.
284
00:28:20,073 --> 00:28:23,744
The transition from
one form of carbon to another
285
00:28:23,911 --> 00:28:25,829
can take millions of years
286
00:28:26,788 --> 00:28:28,081
or can be burned in an instant.
287
00:28:32,252 --> 00:28:35,756
As CO2 dissolves in seawater,
288
00:28:35,839 --> 00:28:37,883
the ocean becomes more acidic.
289
00:28:39,301 --> 00:28:42,763
Every aquarium keeper
knows that the pH value--
290
00:28:42,846 --> 00:28:44,556
the measurement
of water's acidity--
291
00:28:44,640 --> 00:28:46,975
is vital to the health
of any fish tank.
292
00:28:47,059 --> 00:28:49,645
So it's easy to understand
293
00:28:49,728 --> 00:28:52,064
that a change on a global scale
294
00:28:52,147 --> 00:28:54,191
would have a catastrophic effect
on life in the oceans.
295
00:28:55,609 --> 00:28:57,527
As the sea becomes more acidic,
296
00:28:57,611 --> 00:29:00,280
any creature that absorbs carbon
297
00:29:00,364 --> 00:29:01,740
to manufacture a new shell,
298
00:29:01,823 --> 00:29:03,825
a new skeleton,
299
00:29:03,909 --> 00:29:05,535
or a new coral structure,
300
00:29:05,619 --> 00:29:07,537
finds it more
and more difficult,
301
00:29:07,621 --> 00:29:10,249
to the point that
growth slows down,
302
00:29:10,332 --> 00:29:13,543
and the strength of the shell
or skeleton weakens.
303
00:29:13,627 --> 00:29:17,297
Entire coral reefs
will simply soften,
304
00:29:17,381 --> 00:29:19,424
crumble, and disappear.
305
00:29:22,511 --> 00:29:24,304
Imagine the outcry
306
00:29:24,388 --> 00:29:26,682
if science were to predict
the complete extinction
307
00:29:26,765 --> 00:29:28,684
of trees everywhere
308
00:29:28,767 --> 00:29:30,185
by the middle of the century.
309
00:29:31,937 --> 00:29:34,106
This is what
the ocean is faced with:
310
00:29:35,148 --> 00:29:38,360
the complete destruction
of all reefs, everywhere,
311
00:29:38,443 --> 00:29:40,570
within our lifetime.
312
00:29:41,947 --> 00:29:45,617
And some say the point of
no return is already upon us.
313
00:29:49,121 --> 00:29:51,707
Losing reefs would have
a disastrous effect
314
00:29:51,790 --> 00:29:53,709
on the food chain
315
00:29:53,792 --> 00:29:56,128
and the rest of
the marine environment.
316
00:29:57,379 --> 00:29:59,423
Consider, for a moment,
317
00:29:59,506 --> 00:30:03,176
how much our lives depend
upon life in the ocean.
318
00:30:12,477 --> 00:30:15,522
Remember, however,
that nature is resilient.
319
00:30:16,898 --> 00:30:20,319
Coral spawns its eggs
into the sea.
320
00:30:20,402 --> 00:30:23,071
The larvae drifts
on the ocean currents,
321
00:30:23,155 --> 00:30:26,742
some finding their way back
to the reef of their origin.
322
00:30:26,825 --> 00:30:29,745
Others, however, find new homes,
323
00:30:29,828 --> 00:30:33,707
new rocks, new starting places.
324
00:30:33,790 --> 00:30:35,834
By spreading to new areas,
325
00:30:35,917 --> 00:30:38,670
as the world
changes around them,
326
00:30:38,754 --> 00:30:42,007
coral has survived
over millions of years.
327
00:30:54,186 --> 00:30:56,480
Coral will take advantage
of any structure.
328
00:30:58,315 --> 00:31:00,484
So long as the water
is clear and clean
329
00:31:00,567 --> 00:31:03,403
and has ample sunlight,
330
00:31:03,487 --> 00:31:05,864
they'll create
a whole new environment.
331
00:31:11,953 --> 00:31:13,705
Relics of war in the Pacific
332
00:31:13,789 --> 00:31:16,083
are now home to
the reef-builders,
333
00:31:16,166 --> 00:31:19,878
slowly transforming them
over time.
334
00:31:48,824 --> 00:31:51,410
335
00:31:59,418 --> 00:32:02,337
Decommissioned ships
are now regularly sunk
336
00:32:02,421 --> 00:32:04,965
to encourage the development
of new coral reefs.
337
00:32:09,052 --> 00:32:12,556
Even statues can form
the basis of a new habitat,
338
00:32:12,639 --> 00:32:15,016
a new city.
339
00:32:28,029 --> 00:32:29,781
All over the world,
340
00:32:29,865 --> 00:32:32,242
people are trying to lend
the reef-builders
341
00:32:32,325 --> 00:32:33,326
a helping hand.
342
00:32:38,039 --> 00:32:42,711
But reefs cannot rebuild
in an acidified ocean.
343
00:32:48,216 --> 00:32:49,801
The very simple chemistry,
344
00:32:49,885 --> 00:32:52,345
whereby CO2 raises
water's acidity,
345
00:32:52,429 --> 00:32:53,805
is unarguable.
346
00:32:56,725 --> 00:32:59,603
The call for cutting
our carbon emissions,
347
00:32:59,686 --> 00:33:01,980
finding greener
sources of energy,
348
00:33:02,063 --> 00:33:03,982
greener forms of transport,
349
00:33:04,065 --> 00:33:06,943
becomes more vital than ever.
350
00:33:07,027 --> 00:33:10,030
It's the one way
we can all contribute,
351
00:33:10,113 --> 00:33:11,948
however indirectly,
352
00:33:12,032 --> 00:33:15,368
to the recovery
of the world's oceans.
353
00:33:45,190 --> 00:33:47,526
354
00:34:15,971 --> 00:34:18,557
355
00:34:39,828 --> 00:34:41,997
The reef-builders will return.
356
00:34:42,998 --> 00:34:47,919
They will create new hot spots
of diversity in the oceans,
357
00:34:48,003 --> 00:34:50,130
new cities beneath the sea...
358
00:34:50,213 --> 00:34:52,841
if we let them.
359
00:35:16,865 --> 00:35:20,285
Perhaps we can learn
from the lessons of Bikini.
360
00:35:20,869 --> 00:35:23,371
Coral reefs have an amazing
ability to rebuild,
361
00:35:24,623 --> 00:35:28,209
and their influence reaches
far across land and sea.
362
00:35:52,525 --> 00:35:56,071
The last reef is now
our responsibility...
363
00:35:56,154 --> 00:36:00,158
a responsibility
that we cannot ignore.
364
00:36:00,241 --> 00:36:03,995
Its future is in our hands.
365
00:36:04,079 --> 00:36:05,997
The last reef...
366
00:36:06,081 --> 00:36:09,918
is in our hands.
367
00:36:39,489 --> 00:36:41,825
368
00:37:09,561 --> 00:37:12,147
369
00:37:23,158 --> 00:37:25,577
370
00:37:55,440 --> 00:37:58,151
371
00:38:25,470 --> 00:38:28,181
372
00:38:55,500 --> 00:38:58,211
373
00:39:25,530 --> 00:39:28,241
27488
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