The study overturns previous assumptions that most of Greenland’s ice sheet has been frozen for millions of years, the authors said. Instead, moderate, natural warming led to large-scale melting an…
decades ago has revealed that a large part of the country was ice-free around 400,000 years ago, when temperatures were similar to those the world is approaching now, according to a new report – an alarming finding that could have disastrous implications for sea level rise.
At the time, there wasn’t the technology to understand the sediment very well and so it was lost in a freezer for decades, Bierman said. Then, in 2017, it was rediscovered in Denmark. The scientists still needed to figure out how long ago the plants had been growing. To establish the time frame, samples were passed to a team at Utah State University, which uses luminescence technology – a technique which allows them to date the last time the sediment was exposed to daylight.
The potential implications for sea level rise are enormous, Tammy Rittenour, a professor from Utah State University and study co-author said in a statement. “We are looking at meters of sea level rise, probably tens of meters. And then look at the elevation of New York City, Boston, Miami, Amsterdam. Look at India and Africa – most global population centers are near sea level.”
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