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Deep in California’s Sierra mountain range, massive glaciers are vanishing and expected to dissolve entirely by the start of the coming hundred years, leaving summits without glaciers for the initial occasion in human history, recent studies has discovered.

Age-Old Beginnings of Sierra Range Ice Masses

The range's glaciers are more ancient than previously known, dating back many thousands of years, with some as ancient as the most recent glacial period, according to a report released last week.

“Our reconstructed glacial history indicates that a coming glacier-free Sierra Nevada is unprecedented in human history since documented settlement of the Americas ~20,000 years ago,” the article states.

Worldwide Threat to Glaciers

Glaciers around the world are under threat during the climate crisis. A study published in the month of May of the current year determined that almost forty percent of ice sheets are doomed to thaw because of global heating. If this warming rises by 2.7C, which the planet is presently on course for, as many as seventy-five percent will disappear, causing sea level rise and large-scale relocation.

Across the Western United States, ice formations have diminished significantly since they were initially recorded in the late 19th century, according to the report.

Focus on Key Ice Bodies

The new research centers on several Sierra Nevada glacial masses – the Conness, Maclure, Lyell and Palisade glaciers – that are among the biggest and probably most ancient in the mountain chain. Their durability amid climate warming makes them “bellwethers” for studying glacier disappearance in the west, the article notes.

Research Methods and Results

Scientists looked at recently exposed bedrock around the ice formations and took samples to determine how extensively the region was blanketed by glacial ice. They determined that the glaciers have enveloped large areas of the range for far longer than previously known – since before people occupied North America.

The state's glacial sheets attained their peak extents as early as 30,000 years ago, the article’s authors wrote, and a particular of the ice bodies experts studied is thought to have expanded seven thousand years ago, sooner than previously believed. The disappearance of glaciers, for the first time in human history, shows the profound impacts of the climate crisis, a researcher of the investigation said.

Environmental and Representational Consequences

“We’ll be the initial ones to see the glacier-less summits,” said the study's lead researcher, the study’s lead author. “This has environmental implications for flora and fauna. And it’s a symbolic loss. Climate change is very abstract, but these ice masses are tangible. They’re symbolic elements of the Western U.S..”