Episode 5.4 · 27 min

How Plants Transformed the Earth

How the first plants and forests colonized the land-and changed Earth's soils, rivers and climate-begins with a solution to life in air: waterproof cuticles, closable pores, durable spores, internal pipes, roots, wood and eventually seeds. From freshwater green-algal relatives and 471-million-year-old cryptospores to Cooksonia, the Rhynie wetland and the first forests, the episode follows the evidence while showing why early plants still needed water for swimming sperm. As roots and fungal partners deepened soils, forests stabilized rivers, buried carbon as coal and may have raised oxygen above modern levels, though the scale of that oxygen increase remains disputed. The story ends around 360 million years ago at the weedy late-Devonian water's edge, with plants already reshaping the land and its climate.

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Visual credits

30 sources

Sources and credits for imagery used in this film, including material incorporated into explanatory animations.

The freshwater alga Spirogyra
Wiedehopf20
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Micrasterias rotata
Anatoly Mikhaltsov
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Trilete spores and cryptospores — selected specimens
Rubinstein C.V.
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Trilete spores and cryptospores — specimen detail
Rubinstein C.V.
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Cooksonia barrandei (National Museum in Prague)
Skot
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Rynian (Rynie) Chert Thin Section Slide (Complete)
Tom Bishop
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Rhynia stem
Plantsurfer
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Rhynia stem — central conducting strand
Plantsurfer
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Windyfield fossil plant — axis detail
Strullu-Derrien and colleagues (2025)
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Windyfield fossil plant — tuft detail
Strullu-Derrien and colleagues (2025)
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Palaeocharinus feeding apparatus
Carolin Haug
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Rhyniella springtail fossil
Carolin Haug; Royal Society
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Rhyniella fossil mouthparts
Carolin Haug; Royal Society
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Kampecaris obanensis fossil from Kerrera, Scotland
British Geological Survey (credit on University of Texas Jackson School source page)
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Minehead arthropod trackways
Source page: University of Cambridge
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Minehead *Calamophyton* forest reconstruction
Peter Giesen / Chris Berry
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Minehead fossil stump surface with scientist for scale
Source page: University of Cambridge
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Minehead fossil *Calamophyton* logs
Source page: University of Cambridge
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Cairo fossil forest — root-system map
William E. Stein, Christopher M. Berry, Linda VanAller Hernick, Frank Mannolini, Christopher V. Morris, Rob Harrison, Judd Bailey
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Archaeopteris hibernica 2
User:Daderot (modified by User:Kontos )
View original source ↗Source licence: Public domain
Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Wattieza trunk
Skye McDavid
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
soil evidence detail
Khudadad (2021)
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Plant evolution and river-system change — Gibling and Davies
Martin R. Gibling and Neil S. Davies
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Braided River In South Mackenzie Basin
Uploader.
View original source ↗Source licence: Public domain
Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Early seed fossils — paired specimens
Li et al. (2025), Royal Society
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Early seed fossil localities
Li et al. (2025), Royal Society
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Lepidodendron bark imprint, Joggins
Graeme Churchard
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Witten Bodendenkmal 27
Reclus
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Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Fusain Fossil Charcoal
Stocksdale Item found and photographed by Paul Stocksdale
View original source ↗Source licence: CC BY-SA 3.0
Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.
Meganeura monyi MNHN R51142 2
Gaëlle Doitteau & Sandra DAILLIE
View original source ↗Source licence: CC BY 4.0
Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

Research references

Selected sources from the episode’s research and scientific figures.

Music

Meditation From The Star Orion
OctahedronMusic · Envato Elements

Footage and image usage

Credits and usage times retained from the published edition or its production credit record. Where present, times identify visual appearances, not documentary chapters. Source and licence corrections are listed in the visual credits above.

Original animations and figures created by this channel.

How this film was made

Created and editorially directed by Anders Lunde using a custom production system developed over six months. AI assists research, drafting, programming, and visual production; I review and edit the material and make the final editorial decisions. Narration uses text-to-speech. Visuals combine custom-built scientific animations, AI-generated reconstructions, and credited scientific imagery.

Generated reconstructions illustrate scientific interpretations. They are distinct from photographs, specimens, and measured data.

More about the creator and production →

How Plants Transformed the Earth

Visual credits

The freshwater alga Spirogyra

Micrasterias rotata

Trilete spores and cryptospores — selected specimens

Trilete spores and cryptospores — specimen detail

Cooksonia barrandei (National Museum in Prague)

Rynian (Rynie) Chert Thin Section Slide (Complete)

Rhynia stem

Rhynia stem — central conducting strand

Windyfield fossil plant — axis detail

Windyfield fossil plant — tuft detail

Palaeocharinus feeding apparatus

Rhyniella springtail fossil

Rhyniella fossil mouthparts

Kampecaris obanensis fossil from Kerrera, Scotland

Minehead arthropod trackways

Minehead Calamophyton forest reconstruction

Minehead fossil stump surface with scientist for scale

Minehead fossil Calamophyton logs

Cairo fossil forest — root-system map

Archaeopteris hibernica 2

Wattieza trunk

soil evidence detail

Plant evolution and river-system change — Gibling and Davies

Braided River In South Mackenzie Basin

Early seed fossils — paired specimens

Early seed fossil localities

Lepidodendron bark imprint, Joggins

Witten Bodendenkmal 27

Fusain Fossil Charcoal

Meganeura monyi MNHN R51142 2

Research references

Music

How this film was made

Visual credits

The freshwater alga Spirogyra

Micrasterias rotata

Trilete spores and cryptospores — selected specimens

Trilete spores and cryptospores — specimen detail

Cooksonia barrandei (National Museum in Prague)

Rynian (Rynie) Chert Thin Section Slide (Complete)

Rhynia stem

Rhynia stem — central conducting strand

Windyfield fossil plant — axis detail

Windyfield fossil plant — tuft detail

Palaeocharinus feeding apparatus

Rhyniella springtail fossil

Rhyniella fossil mouthparts

Kampecaris obanensis fossil from Kerrera, Scotland

Minehead arthropod trackways

Minehead *Calamophyton* forest reconstruction

Minehead fossil stump surface with scientist for scale

Minehead fossil *Calamophyton* logs

Cairo fossil forest — root-system map

Archaeopteris hibernica 2

Wattieza trunk

soil evidence detail

Plant evolution and river-system change — Gibling and Davies

Braided River In South Mackenzie Basin

Early seed fossils — paired specimens

Early seed fossil localities

Lepidodendron bark imprint, Joggins

Witten Bodendenkmal 27

Fusain Fossil Charcoal

Meganeura monyi MNHN R51142 2

Research references

Music

How this film was made

Minehead Calamophyton forest reconstruction

Minehead fossil Calamophyton logs