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In Our Time · July 2, 2026 · 54m

The Evolution of Trees

Bill Baker, Christopher Berry, Jenny McElwain
Show Notes

Misha Glenny and three botanists and paleobotanists explore the deep history of trees, from their emergence around 400 million years ago when low-lying plants developed stronger stems and grew upright. The discussion covers how trees transformed the planet by creating ecosystems, altering atmospheric composition, and reshaping the conditions for all life that followed. The episode reveals that even modern plants we cultivate as vegetables or houseplants can evolve into trees under the right conditions.

This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.

Highlights

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Trees Emerged 400 Million Years Ago Through Gradual Structural Evolution
Trees evolved approximately 400 million years ago when low-lying plants developed stronger stems and grew taller and more upright, a gradual process rather than a sudden emergence.
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Trees Fundamentally Transformed Earth's Atmosphere and Created Ecosystems
Since their emergence, trees have transformed the planet by creating ecosystems, altering atmospheric composition, and setting the stage for the world as we know it today.
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Modern Garden Plants and Vegetables Can Evolve Into Trees Under Right Conditions
Even plants we grow on windowsills or as vegetables in gardens can evolve into trees in the right environmental and evolutionary conditions.
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Editorial

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Early Trees Had Radically Different Structure From Modern Trees
The earliest trees, such as Calamophyton from the Devonian period, had structural designs quite alien to modern tree architecture.
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Devonian Forests Were Earth's Earliest Known Forests
The Devonian period (around 400 million years ago) saw the emergence of Earth's earliest forests, with fossil evidence from Svalbard, Somerset, Devon, and Germany.
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References

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The Emerald Planet: How Plants Changed Earth's History — David Beerling (2008) — Foundational work on how plants reshaped Earth's history and atmosphere

Misc

✧Even common garden vegetables and houseplants can become trees—evolution and environment matter more than modern plant category labels
✧Trees didn't just evolve; they fundamentally rewrote planetary chemistry and created the conditions for animal life as we know it
✧The earliest trees (around 400 million years ago) were structurally quite different from modern trees—evolution was gradual and experimental
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