10 years to transform the future of humanity -- or destabilize the planet | Johan Rockström

308,076 views ・ 2020-10-15

TED


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00:00
Transcriber: TED Translators Admin Reviewer: Rhonda Jacobs
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譯者: Hsin-Hui Lin 審譯者: Amanda Zhu
00:13
(Beeps)
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(嗶嗶聲)
00:16
[Countdown]
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[倒數計時]
00:17
(Clapboard claps)
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(場記板打板)
00:20
Ten years is a long time for us humans on earth.
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對地球上的我們來說,十年很長。
00:23
Ten turns around the sun.
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我們繞太陽轉十圈。
00:26
When I was on the TED stage a decade ago,
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十年前,我在 TED 演講時,
00:29
I talked about planetary boundaries
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我談論了「地球承載界限」,
00:31
that keep our planet in a state that allowed humanity to prosper.
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它能讓人類在地球上維持昌盛的狀態。
00:36
The main point is that once you transgress one,
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其重點在於, 一旦超越了一項承載界限,
00:39
the risks start multiplying.
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風險便開始大幅增加。
00:41
The planetary boundaries are all deeply connected,
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每項地球承載界線都息息相關,
00:44
but climate, alongside biodiversity, are core boundaries.
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其中以氣候、生物多樣性為核心,
00:47
They impact on all others.
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進而影響其他承載界線。
00:50
Back then we really thought we had more time.
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那個時候,我們真的以為還有很多時間。
00:53
The warning lights were on, absolutely,
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警示燈的確是亮了,
00:56
but no unstoppable change had been triggered.
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但不可挽回的變化尚未觸發。
00:59
Since my talk, we have increasing evidence
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自從我上次的演講, 有越來越多證據顯示
01:02
that we are rapidly moving away
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我們正在加速遠離
01:04
from the safe operating space for humanity on earth.
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人類在地球上所能安全運作的空間。
01:07
Climate has reached a global crisis point.
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氣候已經到達全球危機的程度。
01:11
We have now had 10 years of record-breaking climate extremes:
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我們已經連續十年 出現破記錄的極端氣候,
01:16
fires blaze in Australia, Siberia, California and the Amazon,
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烈火在澳洲、西伯利亞、 加州、亞馬遜蔓延;
01:19
floods in China, Bangladesh and India.
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洪水在中國、孟加拉、印度肆虐。
01:22
We're now enduring heat waves across the entire northern hemisphere.
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如今整個北半球也正遭受熱浪襲擊。
01:26
We risk crossing tipping points
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我們就快要跨過那個臨界點;
01:28
that shift the planet from being our best resilient friend,
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原本地球用超強復原能力
幫我們減緩氣候衝擊,
01:32
dampening our impacts,
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01:33
to start working against us, amplifying the heat.
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現在變成跟我們作對,升高氣溫。
01:37
For the first time, we are forced to consider the real risk
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這是我們第一次被逼著正視
01:42
of destabilizing the entire planet.
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破壞整個星球平衡所帶來的真正風險。
01:45
Our children can see this.
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我們的下一代都意識到了。
01:47
They are walking out of school to demand action,
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他們走出學校,要求有所行動,
01:50
looking with disbelief at our inability to deviate away
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對我們無能為力帶著他們 遠離潛在的災難風險,
01:54
from potentially catastrophic risks.
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他們感到不可置信。
01:57
The next 10 years, to 2030,
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到 2030 年的下個十年內,
01:59
must see the most profound transformation the world has ever known.
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這個世界一定會經歷史上最嚴峻的轉變
02:04
This is our mission.
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這是我們的使命。
02:06
This is the countdown.
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這是倒數計時。
02:08
(Clock ticks)
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(時鐘滴答響)
02:10
When my scientific colleagues summarized, about a decade ago,
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一開始,大約十年前,
我的科學家同儕當時的結論是,
02:14
for the first time,
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02:15
the state of knowledge on climate tipping points,
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從目前對氣候臨界點的認知看來,
02:18
just one place had strong evidence that it was on a serious downward spiral.
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只有一個地方有強烈證據顯示 情勢在迅速惡化,
02:24
Arctic sea ice. (Water sounds)
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那就是北極海冰層; (水聲)
02:26
Other tipping points were long way off --
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其他的臨界點都還離我們很遠——
02:29
50 or 100 turns around the sun.
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還要再繞太陽 50 或 100 圈。
02:32
Just last year we revisited these systems,
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但就在去年,我們重新審視這些系統,
02:36
and I got the shock of my career.
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我感到職涯中前所未有的震驚:
02:39
We are only a few decades away from an Arctic without sea ice in summer.
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再幾十年,北極的夏天就不會有海冰。
02:44
In Siberia, permafrost is now thawing at dramatic scales.
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現在,西伯利亞永凍層 正以驚人速度融化;
02:48
Greenland is losing trillions of tons of ice
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格陵蘭流失數兆噸的冰,
02:51
and may be approaching a tipping point.
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可能就快接近其臨界點;
02:53
The great forests of the North
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北方森林大火,
02:55
are burning with plumes of smoke the size of Europe.
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產生的煙霧範圍有歐洲大陸之大;
02:59
The Atlantic ocean circulation is slowing.
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大西洋洋流循環變慢;
03:02
The Amazon rainforest is weakening
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亞馬遜雨林正在衰退,
03:04
and may start emitting carbon within 15 years.
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十五年內可能開始排碳;
03:08
Half of the coral of the Great Barrier Reef has died.
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大堡礁有半數珊瑚已經死亡;
03:11
West Antarctica may have crossed the tipping point already today.
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現在,西南極冰層 可能早已跨越臨界點。
03:16
And now, the most solid of glaciers on earth, East Antarctica,
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如今,全世界最堅固冰河, 東南極大陸,
03:20
parts of it are becoming unstable.
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有部份也開始變得不穩定。
03:23
Nine out of the 15 big biophysical systems that regulate climate are now on the move,
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十五大調節氣候的生物物理系統中,
有九個正在變動,出現令人憂心的徵兆,
03:29
showing worrying signs of decline
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03:31
and potentially approaching tipping points.
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顯示它們正在衰退並且逼近臨界點。
03:35
Tipping points bring three threats.
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臨界點會帶來三項威脅:
03:38
First, sea level rise.
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第一、海平面上升。
03:40
We can already expect up to one meter this century.
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在本世紀已經可以預期會上升一公尺,
03:43
This will endanger the homes of 200 million people.
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兩億人的家園將受到威脅。
03:47
But when we add the melting ice from Antarctica and Greenland
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但如果再加上南極及格陵蘭的融冰,
03:51
into the equation,
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03:52
this might lead to a two meter rise.
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則將可能上看兩公尺,
03:55
But it won't stop there, it will keep on getting worse.
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而且不會停下來,只會越來越糟。
03:59
Second, if our carbon stores like permafrost and forest
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其次,
如果永凍層和森林等 所貯存的碳開始釋出,
04:03
flip to belching carbon,
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04:05
then this makes the job of stabilizing temperatures so much harder.
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穩定溫度的工作將會變得非常困難。
04:09
And third, these systems are all linked like dominoes:
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第三、這些系統 就像骨牌一樣彼此關聯,
04:13
If you cross one tipping point, you lurch closer to others.
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其中一個到了臨界點, 下一個也不遠了。
04:18
Let's stop for a moment and look at where we are.
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讓我們停一下,看看目前的狀況。
04:21
The foundation of our civilization is a stable climate
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我們的文明開創於穩定氣候、
04:25
and a rich diversity of life.
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生物多樣性豐富的環境之下。
04:27
Everything, I mean everything, is based on this.
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每件事物都是架構在這個基礎上。
04:30
Civilization has thrived in a Goldilocks zone:
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文明社會在宜居帶之中興盛:
04:34
not too hot, not too cold.
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既不太熱、也不太冷。
04:36
This is what we have had for 10,000 years since we left the last ice age.
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從上次冰河期以來, 我們維持了一萬年的宜居狀態。
04:42
Let's zoom out a little here.
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讓我們把時間軸拉長一點。
04:44
Three million years --
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有三百萬年的時間,
04:46
temperatures have never broken through the two degrees Celsius limit.
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溫度從沒打破攝氏 2 度的上限。
04:51
Earth has self-regulated within a very narrow range
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地球自行調節的範圍很窄:
04:54
of plus two degrees in a warm interglacial,
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上升攝氏 2 度,進入暖和的間冰期;
04:56
minus four degrees, deep ice age.
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下降攝氏 4 度,則是大冰河時期。
04:59
Now, we are following a path
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現在,我們走的路徑
05:01
that would take us to a three to four degree world
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可能讓我們在三代內
05:05
in just three generations.
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面臨上升攝氏 3 到 4 度的世界。
05:07
We would be rewinding the climate clock, not one million, not two million,
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我們可能會倒轉氣候時鐘 到不只是一、兩百萬年前,
05:10
but five to 10 million years.
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而是五百萬到一千萬年前。
05:12
We are drifting towards hot-house earth.
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我們正在朝高溫溫室地球前進。
05:16
For each one degree rise,
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溫度每上升一度,
05:17
one billion people will be forced to live in conditions
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就會有十億人被迫居住在 現今標準認定不適居的地方。
05:20
that we today largely consider uninhabitable.
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05:24
This is not a climate emergency, it is a planetary emergency.
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這不是氣候危機,是星球危機。
05:28
My fear is not that Earth will fall over a cliff
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我怕的不是 2030 年 1 月 1 號 地球會突然墜落懸崖;
05:31
on the 1st of January, 2030.
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05:34
My fear is that we press unstoppable buttons in the Earth system.
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我怕的是我們按下地球系統 不可挽回的按鈕。
05:39
What happens in the next 10 years
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接下來十年所發生的事,
05:41
will likely determine the state of the planet we hand over
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可能將會決定 我們交給子孫怎樣的地球。
05:45
for future generations.
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05:47
Our children have every reason to be alarmed.
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他們必然會驚慌失措。
05:51
We need to get serious about stabilizing our planet.
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我們必須嚴陣以待,設法穩定地球。
05:54
Two frontiers will guide this transformation.
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將會有兩道防線引導我們 度過這場大變動:
05:57
The first one is in science.
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第一道防線是科學。
05:59
Here's a new equation for a sustainable planet:
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這裡有個新的永續地球方程式:
06:02
planetary boundaries plus global commons
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「地球承載界線」加「全球公域」
06:05
equals planetary stewardship.
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等於「地球管理」。
06:08
We need to a safe corridor for humanity
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我們需要為人類找到一條安全走廊、
06:11
to allow us all to become stewards of the entire planet,
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讓全民成為整個星球的管理員,
06:15
not to save the planet but to provide a good future for all people.
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不為保護地球, 而是為全人類提供更好的未來。
06:20
And the second frontier is in society.
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第二道防線是社會。
06:22
We need a new economic logic based on well-being.
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我們需要建構在福祉之上的 經濟新思維;
06:25
We are now in a position to provide science-based targets
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我們需要為全球公域、 公司行號以及所有城市
06:28
for all global commons for all companies and cities in the world.
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提供以科學為基礎的目標。
06:34
First task, we need to cut global emissions by half by 2030
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首要任務就是在 2030 前 將全球碳排放量減半,
06:39
and reach net-zero by 2050 or sooner.
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並在 2050 以前達成淨零排放。
06:42
This means decarbonizing the big systems that run our lives:
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這表示跟生活相關的所有系統 都必須是零碳排放:
06:45
energy, industry, transport, buildings.
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能源、產業、交通、建築。
06:48
The fossil fuel era is over.
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化石燃料的時代已經結束。
06:50
We need to transform agriculture from a source of emissions
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我們必須將原是碳排放源的農業
06:54
to a store of carbon,
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轉型成碳貯存庫;
06:55
and critically, we must protect our oceans and land,
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最緊急的是,我們必須保護海洋和土地,
06:58
the natural ecosystems that absorb half of our emissions.
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其中的生態系統足以吸收 地球總排放量的一半。
07:04
The good news is, we can do this.
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好消息是,我們可以做得到。
07:07
We have the knowledge. We have the technology.
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我們有知識、科技,
07:10
We know it makes social and economic sense.
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我們也知道這樣做對社會、經濟都好。
07:14
And when we succeed, we can all take lungfuls of fresh air.
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當我們成功時,我們都可以 深吸一口清新的空氣、
07:18
We will be saying hello to healthy lifestyles
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展開嶄新的健康生活、
07:21
and resilient economies in livable cities.
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在宜居城市中從事健全的經濟活動。
07:25
We are all on this journey around the sun together.
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我們都在這場環繞太陽的共同旅途上。
07:29
This is our only home.
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這裡是我們唯一的家。
07:32
This is our mission: to protect our children's future.
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而我們的任務是: 守住我們子孫的未來。
07:38
Thank you.
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謝謝。
07:40
(Lights click off)
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(燈開關切換聲)
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