A recent study published in the journal Science reveals that a significant portion of Greenland was devoid of ice and instead had a tundra landscape, potentially with trees and woolly mammoths, approximately 416,000 years ago. This discovery challenges the previous belief that the Greenland ice sheet remained mostly intact for the past 2.5 million years. Moderate warming between 424,000 and 374,000 years ago resulted in substantial melting, leading to a sea-level rise of at least five feet, even though carbon dioxide levels were lower than today. These findings suggest that Greenland’s ice sheet is more susceptible to human-induced climate change than previously thought and may experience rapid melting in the future. The study was conducted by a team of scientists from the University of Vermont, Utah State University, and fourteen other institutions. The researchers utilized sediment from a lost ice core that was collected in the 1960s at a secretive US Army base. Advanced luminescence and isotope techniques were employed to directly determine the timing and duration of the ice-free period. The study sheds light on the climate history of Greenland and its implications for future ice melting and rising sea levels.
ScienceDaily: Rediscovered Ice Core Discloses Greenland’s Verdant Past 416,000 Years Ago
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