# Greenland Ice Core Reveals Ancient Climate Secrets Under Military Base Sediment samples from a Cold War site show Greenland was once ice-free tundra. - **Source:** [SlashGear](https://www.slashgear.com) - **Published:** 2026-11-07 - **Topic:** [science](https://brifing.si/c/science) - **Original article:** - **On Brifing:** https://brifing.si/s/b850c954-c64b-49c1-b8ce-e692f5cb7c0a ## Cold War Legacy Discovery Camp Century was a secret U.S. military base in Greenland designed to house nuclear launch sites beneath the ice during the Cold War. While the base served military purposes, it also facilitated the collection of deep sediment samples. These samples remained hidden for decades until their recent analysis provided critical paleoclimatic data. ## Ancient Tundra Evidence Researchers analyzed sediment extracted from nearly a mile beneath the ice sheet. The findings confirm that the area was ice-free approximately 416,000 years ago. Instead of a frozen wasteland, the region supported grasses, shrubs, and mosses, indicating a tundra environment existed long before the arrival of modern human civilizations on Earth. ## Marine Isotope Stage 11 The melting occurred during the Marine Isotope Stage 11, a warming period lasting from 424,000 to 374,000 years ago. This era demonstrates that even moderate global temperature increases can trigger significant ice sheet loss. The data proves that the Greenland ice sheet is highly sensitive to relatively small shifts in atmospheric conditions. ## Sea Level Implications During this ancient interglacial period, the melting of the Greenland ice sheet caused global sea levels to rise by at least five feet. While this measurement might seem minor in isolation, such a rise would result in catastrophic consequences for modern coastal cities globally, threatening infrastructure and displacing millions of people worldwide today. ## Atmospheric CO2 Influence The thawing process was driven in part by atmospheric CO2 levels, which acted slowly over thousands of years. This historical precedent provides scientists with a clearer understanding of how current carbon emissions might affect ice stability. The study serves as a warning regarding the long-term impacts of greenhouse gases on polar ice. ## Scientific Bulletproof Evidence University of Vermont scientist Paul Bierman described the findings as the first definitive evidence that large portions of the Greenland ice sheet vanished during previous warming cycles. This confirmation helps climatologists refine models predicting future ice melt, as it removes uncertainty regarding the historical behavior of the massive Greenland ice sheet. ## Geological Stability Context The study notes that tectonic plate movement was not a factor in this melting, as 416,000 years is too short a timeframe for significant geological shifts. By isolating climate as the primary driver, researchers can confidently attribute the ice loss to atmospheric warming rather than internal volcanic or seismic activity beneath the island. ## Future Climate Modeling By studying these rediscovered samples, modern climatologists gain essential insights into the Earth's climate history. This knowledge is vital for predicting how current ice sheets will respond to ongoing global warming. Understanding past melting events is crucial for developing strategies to mitigate the impacts of rising sea levels on global society. ## Sources covering this story - https://www.slashgear.com/2304102/climate-scientists-cold-war-military-base-samples/ — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._