As the Lab got going in the 1970s, its scientists began developing tree ring chronologies across North America. On a talus slope near New Paltz, NY, scientists found old, undisturbed hemlock trees that contributed to a 400-year record of drought variability in the Hudson Valley. Photo by Francesco Fiondella
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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