What does cracking open green-shiny rocks in a German preschool have to do with feeding eight billion people without oil and gas? In this episode, we sit down with Prof. Oli Jagoutz, professor at MIT and director of the Earth Resources Laboratory (ERL), for a wide-ranging conversation that travels from the Himalayas to the wastewater treatment plant — and makes the case that geology might be one of the most societally relevant sciences of the coming decades.

Oli traces his winding path into the field: the son of a cosmochemist who dragged him along on mantle-sampling campaigns, a self-described "failed" almost-med-student who spent years climbing, traveling, and working as a nurse before discovering that he could inhale geology once he finally found it. His advice to late bloomers — it's not your age that matters, it's that you've figured out what you actually want.

From there the conversation digs into the Kohistan arc, the spectacular tilted-on-its-side cross-section of ancient island-arc crust now exposed in the Himalayas, and what it tells us about how continental crust forms (magmatic differentiation, water, and density sorting). Oli explains why he came to believe the textbook story of the India–Asia collision was wrong — arguing the real collision happened closer to 40 million years ago, not 50 — and why that timing matters for understanding how mountain-building and tropical weathering of calcium- and magnesium-rich rocks may have reshaped global climate.

That climate thread becomes the pivot point of the episode. Oli describes walking away from the decades-old "origin of continental crust" question to chase problems with real-world stakes, and lays out the four areas his lab now tackles: carbon sequestration, critical minerals, geothermal energy, and geological hydrogen. Along the way he challenges the standard weathering-CO2 story (betting instead on the organic side — clays protecting buried organic matter), and walks through a genuinely clever carbon-sequestration scheme that uses sulfur-reducing bacteria and industrial waste gypsum to lock up carbon while making money by recovering elemental sulfur — a chemical the world will desperately need for fertilizer in a post-oil economy.

The episode closes on practical wisdom for students: master the fundamentals, stay broad, actually go to the talks (not just the beer), use tenure to fund "Neverland science," and recognize that an outsider's perspective — connecting dots others haven't — is often where the best ideas come from. Oli also explains how AI-driven, probabilistic "hygrometry" of whole-rock data is opening a new path for mineral prospectivity, and why he thinks metamorphic petrology — the chemistry of hot fluids reacting with rock underground — is the science of the future for mining, energy, and carbon storage alike.

In this episode

How a cosmochemist dad and a broken finger started a career in geology
Why coming to the field "late" can be an advantage
The Kohistan arc and the puzzle of how continental crust is made
Re-dating the India–Asia collision — and why ~40 Ma changes the climate story
Weathering, CO2 drawdown, and the case for the organic carbon pathway
Turning sewage, gypsum, and bacteria into profitable carbon sequestration
Sulfur, fertilizer, and the hidden product tree of oil and gas
Critical minerals, geothermal, and geological hydrogen at MIT's ERL
AI + whole-rock geochemistry for finding copper deposits
Why metamorphic petrology is the way of the future
Advice for students who want to use geology to solve big problems
Oli's "best day as a geologist"

Memorable quotes

"Don't get discouraged when the community thinks you are wrong. You're probably right."
"Just because I haven't worked on it doesn't mean I don't have anything to offer."
"If you can't make it a business, it won't work."
"Every day I go into the office and think: today I'm gonna find something awesome."

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