B2 中高級 美國腔 3814 分類 收藏
開始影片後,點擊或框選字幕可以立即查詢單字
字庫載入中…
回報字幕錯誤
Human beings are everywhere.
With settlements on every continent,
we can be found in the most isolated corners of Earth's jungles,
oceans,
and tundras.
Our impact is so profound, most scientists believe
humanity has left a permanent mark on Earth's geological record.
So what would happen if suddenly, every human on Earth disappeared?
With no one maintaining them, some of our creations backfire immediately.
Hours after we disappear, oil refineries malfunction,
producing month-long blazes at plants like the ones in western India,
the southern United States,
and South Korea.
In underground rail systems like those in London,
Moscow,
and New York City,
hundreds of drainage pumps are abandoned, flooding the tunnels in just three days.
By the end of the first week, most emergency generators have shut down,
and once the fires have gone out,
the earth goes dark for the first time in centuries.
After the first catastrophic month, changes come more gradually.
Within 20 years, sidewalks have been torn apart by weeds and tree roots.
Around this time,
flooded tunnels erode the streets above into urban rivers.
In temperate climates,
the cycle of seasons freezes and thaws these waterways,
cracking pavement and concrete foundations.
Leaking pipes cause the same reaction in concrete buildings,
and within 200 winters, most skyscrapers buckle and tumble down.
In cities built in river deltas like Houston,
these buildings eventually wash away completely —
filling nearby tributaries with crushed concrete.
Rural and suburban areas decay more slowly,
but in largely unsurprising ways.
Leaks, mold, bug and rodent infestations —
all the usual enemies of the homeowner —
now go uncontested.
Within 75 years, most houses' supporting beams have rotted and sagged,
and the resulting collapsed heap is now home to local rodents and lizards.
But in this post-human world, “local”has a new meaning.
Our cities are full of imported plants,
which now run wild across their adopted homes.
Water hyacinth coat the waterways of Shanghai in a thick green carpet.
Poisonous giant hogweeds overgrow the banks of London's Thames River.
Chinese Ailanthus trees burst through New York City streets.
And as sunken skyscrapers add crumbled concrete to the new forest floor,
the soil acidity plummets,
potentially allowing new plant life to thrive.
This post-human biodiversity extends into the animal kingdom, as well.
Animals follow the unchecked spread of native and non-native plants,
venturing into new habitats with the help of our leftover bridges.
In general, our infrastructure saves some animals and dooms others.
Cockroaches continue to thrive in their native tropical habitats,
but without our heating systems,
their urban cousins likely freeze and die out in just two winters.
And most domesticated animals are unable to survive without us —
save for a handful of resourceful pigs, dogs, and feral housecats.
Conversely, the reduced light pollution saves over a billion birds each year
whose migrations were disrupted by blinking communication tower lights
and high-tension wires.
And mosquitos multiply endlessly in one of their favorite manmade nurseries —
rubber tires, which last for almost a thousand years.
As fauna and flora flourish,
Earth's climate slowly recovers from millennia of human impact.
Within 35,000 years,
the plant cycle removes the last traces of lead
left by the Industrial Revolution from Earth's soil,
and it may take up to 65,000 years beyond that
for CO2 to return pre-human levels.
But even after several million years, humanity's legacy lives on.
Carved in unyielding granite,
America's Mt. Rushmore survives for 7.2 million years.
The chemical composition of our bronze sculptures
keeps them recognizable for over 10 million.
And buried deep underground,
the remnants of cities built on floodplains
have been preserved in time as a kind of technofossil.
Eventually, these traces, too, will be wiped from the planet's surface.
Humanity hasn't always been here, and we won't be here forever.
But by investigating the world without us,
perhaps we can learn more about the world we live in now.
提示:點選文章或是影片下面的字幕單字,可以直接快速翻譯喔!

載入中…

【TED-Ed】如果所有人類突然都消失了會發生什麼事? (What would happen if every human suddenly disappeared? - Dan Kwartler)

3814 分類 收藏
April Lu 發佈於 2018 年 11 月 4 日    Kevin Tsai 翻譯    Emily 審核
看更多推薦影片
  1. 1. 單字查詢

    在字幕上選取單字即可即時查詢單字喔!

  2. 2. 單句重複播放

    可重複聽取一句單句,加強聽力!

  3. 3. 使用快速鍵

    使用影片快速鍵,讓學習更有效率!

  4. 4. 關閉語言字幕

    進階版練習可關閉字幕純聽英文哦!

  5. 5. 內嵌播放器

    可以將英文字幕學習播放器內嵌到部落格等地方喔

  6. 6. 展開播放器

    可隱藏右方全文及字典欄位,觀看影片更舒適!

  1. 英文聽力測驗

    挑戰字幕英文聽力測驗!

  1. 點擊展開筆記本讓你看的更舒服

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔