Big picture: marvel at this majestic glacier in Iceland. It could be your last chance

Global warming means this spectacular cave's days are numbered

Savour the beauty of this ice cave because it may not be around for much longer. The structure is underneath the Breiðamerkurjökull glacier in Iceland. Formed by a sub-glacial river, it consists of natural features that are threatened by rising global temperatures.

Glaciologists are monitoring the glacier, which spans 17 sq km in south-east Iceland, to measure the harmful effects of carbon emissions. Teams from the University of Iceland and the Icelandic Met Office have developed a mass-balance measurement, which involves tracking the amount of snowfall in winter and the volume of melting ice in summer.

The data is worrying: "Since 1995, every year except one has displayed negative mass balance," says Thorsteinn Thorsteinsson, 56, a glaciologist at the office. "In 2016, it's negative again."

If trends continue, melting glaciers could cause major flooding and a rise in sea levels. "Glaciers all over the world are melting. In Iceland, we are losing 0.34 per cent a year," says Thorsteinsson. "They will be gone in 200 years if global warming continues like this."

This article was originally published by WIRED UK