UN: Global warming to melt away major glaciers by 2050 — including Yosemite's

Glaciers at some of the most famous World Heritage sites are set to vanish within 30 years due to climate change — including those at Yosemite National Park, a new UN report warns.

Threat level: "Glaciers in a third of the 50 World Heritage sites are condemned to disappear by 2050, regardless of efforts to limit temperature increases," according to the UNESCO report, published Thursday.

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