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Reading the record of the tree rings

By DR. E. KIRSTEN PETERS

Scientists have studied natural climate change for quite a while. Part of what we have learned about past climates comes from tree rings, and thereon hangs an interesting tale going back more than a century.

Flagstaff, Ariz. was a pretty small burg in the 1890s, without the street lamps of big cities ‘back East.’ It also has an elevation of 7,000 feet, making it well over a mile above sea level.

It was those two conditions that brought a young astronomer named A.E. Douglass to the area in 1894. He was commissioned to set up a new telescope by Percival Lowell.

Lowell wa...

 

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