| Bergs in an ice-dammed lake. The edge of the Greenland ice sheet near Kangerlussuaq |  |
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A subglacial tunnel carved by water draining from an ice-marginal lake. Russell Glacier, West Greenland |
| The front of the Athabasca Glacier, British Columbia, Canada. |  |
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Field camp, Greenland, April. 30C below freezing overnight. |
| The summit ice cap of Cotopaxi volcano, Ecuador |  |
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View across the northern terminus of the Russell Glacier in 1984, before the glacier advanced right through the lake |