Layers of soot from coal burning melted Alpine glaciers even in cooler climate of the 19th Century: Sooty air … http://t.co/MbDBfFyFzS

by Freeman Lowell

Layers of soot from coal burning melted Alpine glaciers even in cooler climate of the 19th Century: Sooty air … http://t.co/MbDBfFyFzS:

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