The glacier would have advanced and retreated many times over the ensuing 7,000 years. But never, notes Koch, had historical warming cycles ever shrunk Overlord enough to release these trunks from their primeval deep-freeze -- until now.
"The appearance of this wood indicates that glaciers are becoming much smaller," Koch told CanWest News Service, adding that the stumps' exposure is a strong indicator that "the climate we observe these days is rather unique -- especially considering the pace of change in the past 150 to 200 years is astonishing."
The age of the stumps was measured using radiocarbon dating of samples from the newly exposed wood.
The findings, presented recently at a Denver conference of the Geological Society of America, echo similar studies of glacial retreat in the Yukon, Europe, South America and New Zealand, said Koch.
"It seems like an unprecedented change in a short amount of time," Koch says.
Koch said his stump discovery adds to the growing number of scientific findings that point to man-made causes of what he called the "dramatic change" in global climate over the past 150 years.
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http://www.winnipegfreepress.com/canada/story/4075976p-4676166c.html
[Editor's note - Congratulations to all on achieving story #10,000 on Vive. We've come a long way in a few short years. - DrC.]
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