Satellite images taken more than three decades apart show the disappearance of Iceland's Okjökull, the first glacier to be ...

Deep within Africa’s Great Rift Valley, Virunga National Park is home to some of the continent’s most active volcanoes, ...

In these pictures researchers work on the top of the 4,000ft Kilauea volcano. The shots were taken by local photographer G. Brad Lewis, 56, who said: 'Erupting volcanoes have always fascinated me.