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I'm saying that if it melted away in the summer (as it is likely to do in the next 7 years), how would we know? What evidence would there be either way?

Challenging assumptions is what I do for a living (risk analysis and mitigation).


If it does melt away, as it could, I guess you could check the age of any of the plant matter in and underneath the cap to determine if the area had been exposed earlier.

I also expect that it has advanced and receded many times.

Bears
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