七个世界，一个星球（2019）

由此形成了环绕南极洲的洋流
currents began to swirl right around it.
这是现今地球上
They are now the strongest
最为强劲的洋流
of any currents on the planet.
它们从深海中卷起营养物质
They sweep up nutrients from the depths,
从而创造出世界上最丰富的
and so create one of the richest feeding grounds
海洋觅食地之一
in all the world's oceans.
有些赶来
And some of the creatures
享用美餐的动物
that come here to feast
采用了一些最复杂的捕食战略
do so in a most sophisticated way.
这是座头鲸
Humpback whales.
它们每年夏季都会前来
It's summer, and they've come here
参加盛宴
for a banquet.
寒冷的海水孕育了
The cold waters contain
浩浩荡荡的大群磷虾
great shoals of krill.
据估计磷虾的数量多达400万亿只
It's estimated that there are 400 trillion of them
而它们的重量总和超过地球上
and that their combined weight is greater than that of any other
其它任何一个物种的重量总和
animal species on the planet.
座头鲸接连吐出气泡 编织出一道
To collect them, the humpbacks blow curtains of bubbles,
磷虾无法穿越的气泡网
which the krill won't cross.
随后座头鲸向内螺旋上升 将磷虾群收拢集中
The whales then rise, spiralling inwards, to concentrate the swarm.
南极洲的夏季食物丰饶
Summer in Antarctica is a time of plenty,
大多数座头鲸能在这里获得全年所需的
when most humpbacks are able to put on the reserves they need
脂肪储备
for the whole year.
但这片水域的野生动物们变得前途未卜
But the wildlife in these waters faces an uncertain future.
南极地区的海洋温度正在上升
The Southern Ocean is warming.
南极洲汇聚了世界上90%的冰
90% of the world's ice lies in Antarctica
在某些地区冰雪消融的速度
and, in some parts, the rate at which it's melting
每十年会翻一番
is doubling every decade.
海平面正在上升
Sea levels are rising.
但这里还存在一个更直接的威胁
But there is a more immediate threat.
南极洲是地球上最寒冷的地区 气候变暖正对全球气候模式
The warming of the coldest region on Earth is having a profound effect
产生深远影响
on global weather patterns.
这里的动物们已经感受到气候变化的影响
And this change in the climate is already being felt right here.
这只灰头信天翁的雏鸟只有四个星期大
This grey-headed albatross chick is four weeks old.
它的父母轮流为雏鸟遮挡凛冽的寒风
So far, it has been sheltered from the gales by its parents,
和出海觅食
who take turns to collect food for it out at sea.
这是它们两年来孕育的唯一一只雏鸟
It is the only chick that they will have in two years.
鸟喙间的轻微碰触 加强了彼此之间的纽带
The delicate touching of beaks strengthens their bond.
但是这样的温情时刻不会一直持续
But these tender moments cannot last forever.
在雏鸟渐渐长大时 它们的胃口大增
As a chick grows, so does its appetite.
灰头信天翁父母不得不相继外出捕猎
So one parent has to leave to find food before the other returns.
离别是一个重要的抉择 它们需要时间来适应
Parting is a big step and they take time over it.
这是雏鸟第一次独自面对这个世界
For the first time in its life, this chick is alone.
南极洲是风暴最多 风力最强的大♥陆♥
The Antarctic is the windiest continent,
近年来因为气候变化 暴风雨变得更加频繁
and in recent years, climate change has brought storms
威力更加强劲
that are more frequent and even more powerful.
这里狂风呼啸 风速通常可达每小时110公里
Winds now regularly reach 70mph.
灰头信天翁雏鸟必须坚守在巢穴中
But the albatross chicks must try to stay on their nests.
雏鸟在暴风雨中幸免于难
Surviving the storm is one thing...
但是在低温下存活却是又一大挑战
..but now, off the nest in these freezing temperatures,
雏鸟一旦离开鸟巢 只能勉强存活数小时
this chick has just hours to live.
残酷的环境让它们付出了沉重代价
The brutal conditions have taken their toll.
有些雏鸟最终没能逃过这一劫难
Some chicks have already succumbed to exposure.
父子亲情如此强烈 这位灰头信天翁父亲久久不肯离去
The bond is so strong, it can be hard for a father to let go.
在过去的15年里 灰头信天翁的数量
The albatross population here has more than halved
已经减少了一半以上
in the last 15 years.
它们正面临灭绝边缘
These albatross are facing extinction.
它们根本无法适应外界变化
They simply cannot keep pace with the changes
对栖息地环境造成的影响
affecting their world.
越来越多的灰头信天翁父母返回栖息地
More parents are returning to the colony.
情况似乎不太对劲
Something is not right.
鸟巢里空空如也
The nest should not be empty.
雏鸟其实就在鸟巢下方
The chick is actually right below its parent,
但因为雏鸟没待在鸟巢里 一家人就难以相认
but because it's not on the nest, the parent doesn't recognise it.
成鸟对求助无动于衷
And doesn't help it.
这看起来或许令人费解 灰头信天翁并不是通过视觉、听觉或者嗅觉
Strangely, perhaps, these albatross do not recognise their chicks
来识别自己的孩子
by sight, sound or smell.
相反它们唯一的判断依据就是鸟巢
They identify them by finding them on the nest.
所以这些猛烈的暴风雨给整个灰头信天翁种群
So, these violent storms have created a problem
带来了一大无法解决的难题
that the albatross are not equipped to solve.
这只雏鸟要想捡回一命 就必须依靠自己的力量
If it is to survive, the chick will have to get back on the nest
爬回鸟巢
by itself.
雏鸟终于大功告成
The chick has made it.
亲情纽带迅速重建
The bond is re-established immediately
信天翁雏鸟终于从成鸟那里获得了
and its parent, once again, provides the warmth that the chick
它迫切需要的温暖
so desperately needs.
眼下它算是安全了
It's safe...for now.
南极洲并没有什么地方适宜生存
Nowhere in Antarctica is survival easy.
巴布亚企鹅每天要长途跋涉长达80公里
Gentoo penguins travel up to 50 miles every day
外出觅食
to find food.
现在 它们正要返回幼鸟身边
And they're now returning to their chicks.
它们是海洋中游泳速度最快的企鹅
They are the fastest penguin in the sea
时速可以达到35公里
and can swim at 22mph.
但是海洋中还有其它速度高手
But other animals can swim much faster.
虎鲸
Orca.
这只企鹅只能依靠敏捷逃生
This penguin must rely on its agility.
可惜在4头虎鲸的围追堵截下 它的机会过于渺茫
With four orcas chasing it, the penguin stood little chance.
大多数巴布亚企鹅设法顺利返回了栖息地
Most gentoo parents do make it back to the colony.
今天 成年企鹅收获颇丰 带回了大量磷虾
Today, it's been a good hunt for krill.
也许有些太多了
Perhaps too good.
随着幼鸟们渐渐长大 莫西干发型
The chicks grow and it seems that the Mohawk style
似乎再次流行起来
is back in fashion.
这只是暂时的
It's just a phase.
长大还会变样
He'll grow out of it.
它很快就会换掉体表残留的绒羽 然后准备离开栖息地
He'll soon lose these remaining down feathers and be ready to leave
独自外出觅食
the colony and collect food for himself.
但是因为气候变化 要做到这点变得越来越难
But doing so is becoming harder because of climate change.
这个地区的冰川大量融化崩解
Glaciers in the region are now calving faster
消融速度创出了新记录
than they have done since records began.
现在各个海湾里布满了杂乱的浮冰
And this brash ice now fills the bays.
现在是秋季
It's autumn.
这些幼鸟早已换掉稚嫩的绒羽 此刻它们饥肠辘辘
The chicks have lost their down feathers and they're hungry.
必须首次尝试出海
They must go to sea for the first time.
但下水的话 它们可能会遭到浮冰的无情碾压
But now there's a risk of being crushed between blocks of ice.
它们必须到达远处的冰山
They have to get to the distant icebergs...
然后前往遥远的广阔海洋
..and so reach the open ocean that lies beyond.
说起来容易做起来难
And that is easier said than done.
豹海豹靠近了
A leopard seal...
它们是巴布亚企鹅的天敌
..their main predator.
它体形庞大 身长约有3米
It's a giant, three metres long.
这种遍布浮冰的环境 为它的捕猎提供了便利
These icy conditions help it to hunt.
这种情况下 企鹅既不能顺利行走 也不能自♥由♥游动
The penguins can neither walk nor swim.
它们根本无法判断豹海豹会从何处发起攻击
They have no way of telling where the seal will strike.
它们成了唾手可得的美食
These are easy pickings.
有些企鹅果断选择了撤退
For some, it's time to retreat.
可是现在一切又回到了原点
But now, it's back to square one.
它别无选择 只能再次尝试突破天敌的围追堵截
There's no alternative but to run the gauntlet once again.
这只豹海豹似乎在故意逗弄猎物
The seal seems to be toying with this penguin.
而企鹅安全在望
But safety is in sight.
这块浮冰十分靠近开阔海域
The ice floe is near the open ocean.
但这只企鹅已经筋疲力尽了
But this penguin is exhausted.
也许它觉得这么做有些得不偿失
Perhaps it's not worth it, after all.
冬季即将来临
Winter is coming.
南极洲正在经历一场巨变
Antarctica now undergoes a major transformation.
每天都有10万多平方公里的海洋变成冰封之地
Every day, 40,000 more square miles of sea freeze over.
到了冬末 南极洲的冰面面♥积♥整个翻了一倍
By the end of winter, the continent has doubled in size.
这是目前世界上最大的白色荒漠
This is by far the largest desert in the world.
不过在冰封的海面之下 隐藏着一个巨大的秘密
But the frozen surface of the sea hides a great secret.
冰面上的环境极端恶劣 但冰面之下的
It may be hostile above the ice, but below it,
生存环境相对稳定 这里的海洋生命历经数千年的岁月变迁
conditions are so stable that life over millennia