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Episode 4.5 · 14 min

Snowball Earth

The evidence for the Cryogenian ice ages, the feedbacks that froze and thawed Earth, and the refuges where life may have endured.

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Visual credits

9 sources

Visual sources include third-party material incorporated into custom animations. License information is reproduced from source records; an unrecorded license does not mean a work is public domain.

  • Tillite (Elatina Formation, Neoproterozoic; Enorama Creek section, Flinders Ranges, South Australia) 10

    James St. John

    View original source ↗CC BY 2.0

  • Cryogenian-Ediacaran boundary (Nuccaleena Formation over Elatina Formation, Neoproterozoic; Enorama Creek section, Flinders Ranges, South Australia) 3

    James St. John

    View original source ↗CC BY 2.0

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Scientific figure · source page 2

    Huyue Song et al.

    View original source ↗License not recorded

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Scientific figure · source page 2

    Huyue Song et al.

    View original source ↗License not recorded

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Scientific figure · source page 2

    Fatima Husain et al.; Figure 1 field/context credits as stated in the source article

    View original source ↗License not recorded

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Meltwater ponds on George VI (50979868352)

    Julien Seguinot from Lille, France

    View original source ↗CC BY-SA 2.0

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Meltwater Ponds on the Amery Ice Shelf (153841 - oli 20250101 lrg)

    NASA Earth Observatory images by Wanmei Liang, using Landsat data from the U.S. Geological Survey. Story by Kathryn Hansen.

    View original source ↗Public domain

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Scientific figure · source page 3

    Fatima Husain et al.; photographs Roger E. Summons

    View original source ↗License not recorded

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

  • Scientific figure · source page 3

    Adrian Tasistro-Hart et al.

    View original source ↗License not recorded

    Incorporated into an explanatory animation; presentation may include cropping, labels and overlays.

Research references

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

  1. https://www.science.org/doi/10.1126/sciadv.1600983 ↗
  2. 10.1126/science.1183325 ↗
  3. 10.1130/G36511.1 ↗
  4. https://pmc.ncbi.nlm.nih.gov/articles/PMC12067226/ ↗
  5. https://doi.org/10.2475/ajs.300.5.347 ↗
  6. https://doi.org/10.1016/0012-821X(95)00106-M ↗
  7. https://doi.org/10.1016/j.crte.2007.10.006 ↗
  8. https://doi.org/10.1016/j.earscirev.2020.103298 ↗
  9. DOI: 10.1016/j.epsl.2026.119837 ↗
  10. https://doi.org/10.1130/G53722.1 ↗
  11. https://doi.org/10.1016/j.gca.2021.04.005 ↗
  12. https://doi.org/10.1130/G51669.1 ↗
  13. DOI: 10.1073/pnas.2525919123 ↗
  14. https://doi.org/10.5281/zenodo.16988254 ↗
  15. https://esd.copernicus.org/articles/15/215/2024/ ↗
  16. https://www.nature.com/articles/s41467-023-37172-x ↗
  17. https://doi.org/10.1016/0301-9268(76)90030-9 ↗
  18. https://doi.org/10.1016/j.precamres.2016.03.014 ↗
  19. https://pmc.ncbi.nlm.nih.gov/articles/PMC6926012/ ↗
  20. https://www.nature.com/articles/s41467-025-67155-z ↗
  21. https://doi.org/10.1098/rsos.240154 ↗
  22. https://www.nature.com/articles/s41467-025-60713-5 ↗
  23. https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2025JD044833 ↗
  24. https://www.nature.com/articles/nature23457 ↗
  25. https://doi.org/10.1111/gbi.12378 ↗
  26. https://doi.org/10.1126/sciadv.adt2147 ↗
  27. https://doi.org/10.1126/sciadv.adf9999 ↗
  28. https://cp.copernicus.org/articles/18/759/2022/ ↗
  29. https://www.nature.com/articles/s41467-024-51412-8 ↗
  30. https://www.nature.com/articles/s41467-024-47873-6 ↗
  31. https://www.nature.com/articles/s41561-024-01479-1 ↗
  32. https://www.nature.com/articles/nature11445 ↗
  33. 10.1130/G38098.1 ↗
  34. https://scholarworks.boisestate.edu/geo_facpubs/63/ ↗
  35. https://pmc.ncbi.nlm.nih.gov/articles/PMC3890860/ ↗
  36. https://projects.iq.harvard.edu/files/fmacdonald/files/rooney_etal_geology_2015.pdf ↗
  37. https://www.sciencedirect.com/science/article/pii/S0301926818300603 ↗
  38. https://doi.org/10.1126/sciadv.1600983 ↗
  39. https://pmc.ncbi.nlm.nih.gov/articles/PMC12342614/ ↗
  40. https://digital.library.adelaide.edu.au/items/1de8f263-f9a6-493c-a6b9-be4b4d7b8977 ↗
  41. https://www.nature.com/articles/s41467-017-01453-z ↗
  42. https://doi.org/10.1016/j.sedgeo.2015.04.001 ↗
  43. https://doi.org/10.1038/s41561-024-01406-4 ↗
  44. https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024GC012038 ↗
  45. https://pmc.ncbi.nlm.nih.gov/articles/PMC153566/ ↗
  46. https://pmc.ncbi.nlm.nih.gov/articles/PMC11336685/ ↗
  47. https://doi.org/10.1016/j.palaeo.2020.110116 ↗
  48. https://pmc.ncbi.nlm.nih.gov/articles/PMC7233469/ ↗
  49. https://pmc.ncbi.nlm.nih.gov/articles/PMC11838005/ ↗
  50. https://pmc.ncbi.nlm.nih.gov/articles/PMC10456883/ ↗
  51. https://doi.org/10.1038/s41559-020-1122-9 ↗
  52. https://doi.org/10.1016/j.precamres.2024.107433 ↗
  53. https://discovery.ucl.ac.uk/id/eprint/10210648/1/s41467-025-60700-w.pdf ↗
  54. https://iugs-geoheritage.org/geoheritage_sites/glacial-record-of-the-marinoan-snowball-earth/ ↗
  55. https://news.mit.edu/2025/when-earth-iced-over-early-life-may-have-sheltered-meltwater-ponds-0619 ↗
  56. https://x.com/igc2028canada/status/1818300527794704528 ↗
  57. https://www.geolsoc.org.uk/science-and-policy/100-great-geosites/outcrops/islay-snowball-earth-deposits/ ↗
  58. https://commons.wikimedia.org/wiki/File:Cryogenian-Ediacaran_boundary_(Nuccaleena_Formation_over_Elatina_Formation,_Neoproterozoic;_Enorama_Creek_section,_Flinders_Ranges,_South_Australia)_10.jpg ↗
  59. https://x.com/polarwander/status/991832559507009536 ↗
  60. https://x.com/polarwander/status/991313285768101888 ↗
  61. https://x.com/polarwander/status/980275438978187264 ↗
  62. https://x.com/SubatomicEmily/status/1282842139777396736 ↗
  63. https://x.com/DEM_sagov/status/1615155706071498752 ↗
  64. https://www.youtube.com/watch?v=iqd2NOgWWaE ↗
  65. https://www.youtube.com/watch?v=hV8zEAfje98 ↗
  66. https://www.youtube.com/watch?v=RSjQWrlFL6E ↗
  67. https://www.youtube.com/watch?v=TJ_Ef4bX2EM ↗
  68. https://www.youtube.com/watch?v=sLpkolzXddY ↗
  69. dutkiewicz 2024 low outgassing ↗

Music

  • Meditation From The Star Orion
    OctahedronMusic · Envato Elements

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 →