Podcast Summary:

New Books Network — Gerta Keller, "The Last Extinction: The Real Science Behind the Death of the Dinosaurs" (Diversion Books, 2025)
Host: Gregory McNiff
Guest: Dr. Gerta Keller
Date: October 4, 2025

Overview

In this episode, host Gregory McNiff interviews renowned paleontologist Dr. Gerta Keller about her new book, The Last Extinction: The Real Science Behind the Death of the Dinosaurs. The conversation explores Keller’s groundbreaking research challenging the dominant asteroid impact theory of dinosaur extinction, delves into the scientific “Dinosaur Wars” of the past forty years, and touches on Keller’s personal journey from rural Switzerland to Princeton. The episode concludes with a sobering discussion on the future of scientific integrity and climate change.

Key Discussion Points & Insights

Gerta Keller’s Personal Journey (05:01–14:30)

• Humble Beginnings: Keller describes her childhood near Liechtenstein and Switzerland, being one of twelve children in a poor family. She was an independent thinker, exploring the mountains alone from a young age.
  “I was number six... I did my own think already from about 2, 3 years old. I seem to have been pretty much on my own.” (05:22)
• Barriers to Education: Societal expectations limited her to factory or farm work, or dressmaking. She saved for a design school in Zurich but the money was used by her mother, pushing Keller to work at Christian Dior in Zurich, barely surviving on her wages (08:31).
• World Traveler: She sought adventures, traveling through conflict zones like Vietnam, Cambodia, and Indonesia. In Sydney, Australia, she survived a gunshot wound during a bank robbery (10:48).
• Academic Path: Arrival in San Francisco and influence from Haight-Ashbury's “flower children” led her to take entrance exams and study at San Francisco State, eventually transferring to Stanford for microfossil research, as dinosaurs were then an unfashionable field (13:00).

Academic Research and Early Challenges (14:30–21:04)

• Pioneering Discovery: On a research vessel off the Japan Trench, Keller made a significant geological discovery about island subduction, facing hostility and even threats from Japanese counterparts who discounted her contribution due to gender bias.
  “They meant to get rid of me. And I...” (15:37)
  “They took all the credit. I never got any credit whatsoever.” (18:06)
• Standing for the Evidence: American colleagues provided some support, and the experience set a precedent for scientific resistance she would later face.

The Dinosaur Wars: Impact Theory vs. Deccan Volcanism

The Rise of the Impact Theory (22:03–29:10)

• Alvarez’s Asteroid Theory: Nobel laureate Luis Alvarez and collaborators dominated scientific discourse after 1980, positing that a giant asteroid caused the K-T (Cretaceous-Paleogene) extinction.
• Scientific Intransigence: Keller recounts attending a small, influential conference at Alvarez’s invite, where her data were dismissed outright —
  “Don’t bother us with your data. We don’t need it and we don’t care about it.” — Luis Alvarez (31:13)
• Pressure to Conform: She recounted advice from paleontologist David Raup:
  “When you are with big people, you should stay quiet, not say anything. You will go far as long as you stay quiet.” (32:43)

Challenging the Consensus (34:44–42:49)

• Problems with Iridium Data: Keller explains that the famous iridium layer (supposed to mark the extinction-causing impact) was repeatedly misinterpreted or even fabricated. Independent analysis by physicists helped disprove its origins as extraterrestrial in core K-T samples.
  “Iridium was never there in prime big deal days.” (37:05)
• Scientific Stonewalling:
  “Impactors, I call them impactors. They simply denied whatever they picked to deny and there was never any real data... they would just create something else.” (41:18)
• Her Approach: Keller employed stratigraphy, precise dating, micropaleontology, and sediment analysis—finding many species were already declining before the alleged impact.

The Deccan Volcanism Alternative (42:49–48:46)

• Deccan Traps: Keller’s research points to immense volcanic eruptions in India’s Deccan Traps as causing prolonged environmental stress leading to extinction.
  “Deccan volcanism in India is absolutely massive... It was the mass extinction right there in front of me and it was the tiniest microfossils you can find, which had already died, except for one species. And that one species is the survivor that is still alive today.” (43:01)
• Hybrid Theories: By the late 2000s, as evidence mounted, some researchers proposed a dual cause (“one-two punch”) — both impact and volcanism — but Keller insists newer data points to volcanism as the main driver.
• Scientific Stubbornness:
  “How can you admit to have been wrong after 40 years when we all knew all along they were wrong?” (48:46)

Breakdown of the Scientific Process (49:43–51:03)

• Collapse of Peer Review: Editors at Science and Nature prioritized the impact story, sometimes publishing flawed or knowingly incorrect work.
  “It was a complete breakdown in the process... NASA wanted the story to be there because they got a lot of money for it.” (50:19)
• Why the Theory Persisted: Combination of scientific authority, institutional inertia, and financial incentive kept the asteroid theory dominant for decades.

Climate Change, Future Extinctions, and Scientific Warning

The Sixth Extinction (51:03–54:29)

• Urgency: Keller has been warning of an impending sixth mass extinction linked to human activity for over a decade.
  “I now believe that it is already right on board in a sense. The extinction has already happened and it's continuing.” (51:20)
• Driver: She attributes it mainly to climate change from fossil fuel use, suggesting prospects are bleak unless carbon emissions radically decline.
  “It's too far gone but we can survive it if we can stop the fossil fuel production. And that has never happened because we tried to stop it in 2000 and it didn't work.” (54:24)

Reflections on Science and Gender (55:04–58:55)

• Women in Science: Keller is less optimistic about progress; she sees ongoing “hocus pocus” and careerist politics overshadowing true scientific inquiry.
  “What is being called science today does not seem like what I used to think of science. It is always something that is... not the real thing or real science.” (55:59)
• Institutional Barriers: She notes both financial incentives (“money, prestige”) and continuing gender bias inhibit real progress.
• International Collaboration: Despite challenges, Keller has found support, especially among Indian geoscientists receptive to evidence over dogma.

Notable Quotes & Memorable Moments

• On dismissing inconvenient data:
  “Don’t bother us with your data. We don’t need it and we don’t care about it.”
  — Luis Alvarez at his private conference (31:13)
• On dogmatic consensus:
  “How can you admit to have been wrong after 40 years when we all knew all along they were wrong?” (48:46)
• On the scientific climate:
  “What is being called science today does not seem like what I used to think of science.” (55:59)
• On advice to young women in science:
  “I’m not this confident these days that things will turn out right... somehow it never seems to end up as the real science.” (55:59)

Important Segments (Timestamps)

• Gerta Keller’s early life and inspiration — 05:01–14:30
• First major discovery and gendered resistance — 14:30–21:04
• Origin of the “Dinosaur Wars” — 22:03–29:10
• Confrontation with Alvarez and the scientific elite — 29:10–34:44
• Disproving the iridium layer, questioning impact theory — 34:44–42:49
• Deccan volcanism as the extinction driver — 42:49–48:46
• Scientific process breakdown (Science/Nature/peer review) — 49:43–51:03
• Warnings about the sixth extinction — 51:03–54:29
• Women in science and the problem of “hocus pocus” research — 55:04–58:55

Final Thoughts

Dr. Gerta Keller delivers both a personal and scientific testimony on challenging orthodoxy in paleontology and exposes how consensus can be shaped more by power and inertia than by evidence. Her research on Deccan volcanism changes the narrative about dinosaur extinction, urges for vigilance against the repetition of past scientific mistakes, and warns of a rapidly approaching human-driven extinction event. Both her scientific rigor and personal resilience offer a lesson in standing up for data-driven truth, even when it is unpopular or inconvenient.