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Nature's Reclamation

Short answer: The Reel retells a famous thought experiment popularized by journalist Alan Weisman's 2007 book The World Without Us. In his version of New York, the first big change comes underground: about 800 pumps that keep groundwater out of the subway would stop, and tunnels would flood within days.

Freeze-thaw cycles would crack pavement for weeds and then trees, corroding steel would undermine streets and buildings over decades, and forest would cover much of the city within a couple of centuries. There is a real-world test case: Pripyat, near Chernobyl, abandoned in 1986, where trees are taking over streets and wildlife is thriving.

VideoWrite-up5 sources
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What should you know about Nature's Reclamation?

Quick facts. Each one stands alone and has a stable ID you can cite.

  1. If New York lost power, its subway pumps would stop and the tunnels would flood within days.

    DD-066-F01 · Write-up · Exhibit B (Days: the subways flood)

  2. In Pripyat, abandoned since 1986, trees are regenerating along streets and wildlife populations are abundant.

    DD-066-F02 · Write-up · Exhibit E (A real test case: Pripyat)

Video transcript: Nature's Reclamation: If People Vanished, the City Would Go Green

DID YOU KNOW? If humanity vanished overnight nature would begin reclaiming cities almost immediately. Grass and weeds would sprout through cracks in pavement within days. Within a few years, trees would take root in sidewalks and rooftops, and vines would cover buildings as ecosystems rebalance. Within a few centuries, skyscrapers would collapse from rust and erosion, and dense forests or wetlands would replace the urban sprawl. NOW YOU KNOW!

Burned-in captions, read frame by frame (see transcript.md) · 21.6s Reel ·

Video coming soonNature's Reclamation · Instagram Reel
Nature's Reclamation: If People Vanished, the City Would Go Green Instagram Reel · · 21.6s

The write-up

If people vanished, the city would go green. Pumps would fail within days, weeds would come within a season and forests within centuries.

  1. Exhibit A

    A thought experiment

    Nobody can test this directly. The Reel follows a scenario Alan Weisman laid out in The World Without Us (2007), built from interviews with engineers, ecologists and city workers.

  2. Exhibit B

    Days: the subways flood

    New York's subway sits below the water table. About 800 pumps move some 13 million gallons of groundwater a day; without power they would stop, and tunnels would flood within days.

  3. Exhibit C

    Years: cracks become gardens

    Freeze-thaw cycles widen cracks in pavement, and seeds and soil collect in them. Weeds come first, followed by shrubs and trees.

  4. Exhibit D

    Decades to centuries: steel gives way

    As water reaches steel supports, rust weakens them. Weisman suggests streets above flooded tunnels could buckle within decades and many steel-framed buildings would fail over the following decades to centuries, while stone and concrete structures last longer.

  5. Exhibit E

    A real test case: Pripyat

    Pripyat, near Chernobyl, was evacuated in 1986. A 2015 survey found 20 tree species regenerating, mostly in street-side and grove plots, and a separate census found abundant elk, deer, boar and wolves in the exclusion zone.

Questions people ask about Nature's Reclamation

Whose 2007 book popularized this thought experiment?

The book is The World Without Us.

Source: Write-up · Exhibit A (A thought experiment) · An Earth Without People: interview with Alan Weisman (Scientific American, 2007); Imagining a World Without Humans (NPR, 2007)

What would fail first in New York?

About 800 pumps keep the tunnels dry.

Source: Write-up · Exhibit B (Days: the subways flood) · The World Without Us: interview with Alan Weisman (Living on Earth, 2007)

What opens pavement to weeds?

Seeds and soil then collect in the cracks.

Source: Write-up · Exhibit C (Years: cracks become gardens) · The World Without Us: interview with Alan Weisman (Living on Earth, 2007); An Earth Without People: interview with Alan Weisman (Scientific American, 2007)

What weakens steel buildings once people are gone?

Streets over flooded tunnels could buckle within decades.

Source: Write-up · Exhibit D (Decades to centuries: steel gives way) · The World Without Us: interview with Alan Weisman (Living on Earth, 2007); An Earth Without People: interview with Alan Weisman (Scientific American, 2007)

Which abandoned city offers a real-world test case?

It was evacuated in 1986 after Chernobyl.

Source: Write-up · Exhibit E (A real test case: Pripyat) · Lacan, McBride & De Witt, Urban forest condition and succession in the abandoned city of Pripyat (Urban Forestry & Urban Greening, 2015); Deryabina et al., Long-term census data reveal abundant wildlife populations at Chernobyl (Current Biology, 2015)

Test Your Knowledge

All quizzes →

5 questions, all from this case file. Answers are revealed instantly.

  1. Whose 2007 book popularized this thought experiment?

    1. Rachel Carson
    2. Alan Weisman
    3. Carl Sagan
    4. E. O. Wilson
    Show the answer

    Answer: B. Alan Weisman The book is The World Without Us. Source: Write-up · Exhibit A (A thought experiment) · An Earth Without People: interview with Alan Weisman (Scientific American, 2007); Imagining a World Without Humans (NPR, 2007)

  2. What would fail first in New York?

    1. The bridges
    2. The subway pumps
    3. The skyscrapers
    4. The parks
    Show the answer

    Answer: B. The subway pumps About 800 pumps keep the tunnels dry. Source: Write-up · Exhibit B (Days: the subways flood) · The World Without Us: interview with Alan Weisman (Living on Earth, 2007)

  3. What opens pavement to weeds?

    1. Earthquakes
    2. Freeze-thaw cracking
    3. Acid rain alone
    4. Termites
    Show the answer

    Answer: B. Freeze-thaw cracking Seeds and soil then collect in the cracks. Source: Write-up · Exhibit C (Years: cracks become gardens) · The World Without Us: interview with Alan Weisman (Living on Earth, 2007); An Earth Without People: interview with Alan Weisman (Scientific American, 2007)

  4. What weakens steel buildings once people are gone?

    1. Sunlight
    2. Rust from water reaching the steel
    3. Birds
    4. Wind alone
    Show the answer

    Answer: B. Rust from water reaching the steel Streets over flooded tunnels could buckle within decades. Source: Write-up · Exhibit D (Decades to centuries: steel gives way) · The World Without Us: interview with Alan Weisman (Living on Earth, 2007); An Earth Without People: interview with Alan Weisman (Scientific American, 2007)

  5. Which abandoned city offers a real-world test case?

    1. Pompeii
    2. Pripyat
    3. Detroit
    4. Machu Picchu
    Show the answer

    Answer: B. Pripyat It was evacuated in 1986 after Chernobyl. Source: Write-up · Exhibit E (A real test case: Pripyat) · Lacan, McBride & De Witt, Urban forest condition and succession in the abandoned city of Pripyat (Urban Forestry & Urban Greening, 2015); Deryabina et al., Long-term census data reveal abundant wildlife populations at Chernobyl (Current Biology, 2015)

Cite this case file

Easterling, Marcus. "Nature's Reclamation." The Detail Department (DetailEnjoyer), case file DD-066, last updated Oct 28, 2025. https://detailenjoyer.com/case/natures-reclamation/

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