Do ice-core bubbles indicate man-made global warming during Roman times?

Source: Examiner.com
Details: In 104 B.C., historical records indicate that the Vulsini Volcano erupted 52 miles North-Northwest of Rome. In 122 B.C., Romans recorded the eruption of Sicily's Mount Etna, describing "a large eruption which caused heavy lapilli fall in Catania, and ...

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