The melting of ice and snow is one of the 10 key threats from climate change, an Intergovernmental Panel on Climate Change report published in February said
Glaciers at many UNESCO World Heritage sites including Yellowstone and Kilimanjaro National Park will likely vanish by 2050, the UN agency warned Thursday, urging leaders to act fast to save the rest.
The warning followed a study of 18,600 glaciers at 50 World Heritage sites—covering around 66,000 square kilometres (25,000 square miles)—which found glaciers at a third of the sites were "condemned to disappear".
The study "shows these glaciers have been retreating at an accelerated rate since 2000 due to CO2 emissions, which are warming temperatures", UNESCO said.