State of the Planet

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Pratigya Polissar Sees Landscapes Changing Through a Microscope


The word fossils typically conjures images of T-Rexes and trilobites. Pratigya Polissar thinks micro: A paleoclimatologist, he digs into old sediments and studies molecular fossils—the microscopic remains of plants and animals that can tell us a lot about what was living in a particular time period. His work has helped uncover the shifting pattern of the East Asian monsoon and its possible impacts on early Chinese societies, and the past record of drier times in America’s Pacific Northwest. And by looking back to what was thriving during a very warm period long ago, he’s looking into our future, as well.

In the latest in our video series about Earth Institute researchers, Polissar, Lamont associate research professor at the Lamont-Doherty Earth Observatory, talks about his work, and what inspired him to go into his field. See more in the series here.

Video production by the Columbia News video team.

Photo of the Earth from space with the text "Lamont at AGU25" on top.

AGU25, the premier Earth and space science conference, takes place December 15-19, 2025 in New Orleans, Louisiana. This year’s theme—Where Science Connects Us—puts in focus how science depends on connection, from the lab to the field to the ballot box. Once again, Lamont-Doherty Earth Observatory and Columbia Climate School scientists, experts, students, and educators are playing an active role, sharing our research and helping shape the future of our planet. #AGU25 Learn More

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