It is based in part on their analysis of ice cores extracted from glaciers in Greenland. Volcanic eruptions, especially large ones, can influence the climate. They release gases including sulfur ...

A researcher inspects an ice core collected from Greenland. These records can give scientists a precise date of when volcanic eruptions occurred around the world over the last 2500 years.

The rare sight of a volcanic eruption, taken by a plane passenger flying over Iceland, has amazed viewers online.