Tree Lines

For John, BLUF:  Science is a never-ending quest.  Nothing to see here; just move along.

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Study:  Earth was warmer in Roman, Medieval times

This is a headline from The Daily Caller, from 13 December.  The author, Michael Bastasch, blames the Swedes of this finding.  The article states:

The study, by scientist Leif Kullman, analyzed 455 “radiocarbon-dated mega-fossils” in the Scandes mountains and found that tree lines for different species of trees were higher during the Roman and Medieval times than they are today. Not only that, but the temperatures were higher as well.

This can't be right.

To paraphrase Turkish Prime Minister Recep Tayyip Erdoğan:  "Science is like a streetcar.  When you come to your stop, you get off."?

That can't be right, can it?

Regards  —  Cliff