Glaciers across the globe - including the last ones in Africa - will be unavoidably lost by 2050 due to climate change, the UN says in a report.

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

Mount Kilimanjaro's last glaciers will vanish as will glaciers in the Alps and Yosemite National Park in the US.

Mount Kilimanjaro is the highest mountain in Africa and the highest single free-standing mountain above sea level in the world

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

The retreat and disappearance of glaciers was "among the most dramatic evidence that Earth's climate is warming", the report said.

The remaining glaciers in the other two thirds of UN World Heritage sites could be saved, but only if the world limits global warming to 1.5C