Glaciers across the globe will be unavoidably lost by 2050 due to climate change.

A UNESCO report found, glaciers in a third of UN World Heritage sites will melt within three decades. 

The report, which makes projections based on satellite data, comes as world leaders prepare to meet in Egypt for next week's COP27 climate change conference.

About 18,600 glaciers have been identified across 50 UN World Heritage sites. They represent almost 10% of the Earth's glacierised area and include renowned tourist spots and places sacred to local populations.