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

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

They will melt regardless of the world's actions to combat climate change, the authors say.

They will melt regardless of the world's actions to combat climate change, the authors say.

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.

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

"We hope we might be wrong, but this is the hard science," said UNESCO project officer Tales Carvalho Resende, one of the authors.

"Glaciers are one of the valuable indicators of climate change, because they're visible. This is something we can really see happening."