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Far in California’s Sierra mountain range, enormous ice formations are disappearing and expected to melt away completely by the beginning of the coming hundred years, leaving ice-free peaks for the first time in human history, new research has found.

Ancient Origins of Sierra Range Glaciers

The mountain range’s glaciers are more ancient than previously known, dating back many thousands of years, with a few as ancient as the last ice age, according to an article released recently.

“Our reconstructed ice age record shows that a coming glacier-free Sierra Nevada is unprecedented in the history of humankind since documented settlement of the Americas ~20,000 years ago,” the article declares.

Worldwide Threat to Ice Formations

Ice masses globally are at risk during the climate crisis. A study published in May of the current year found that almost forty percent of ice sheets are doomed to melt because of global heating. If such heating rises by 2.7C, which the world is currently on course for, as up to seventy-five percent will vanish, 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 1800s, according to the report.

Focus on Key Ice Bodies

The recent study focuses on four Sierra Nevada glacial masses – the Palisade, Lyell, Maclure and Conness ice sheets – that are some of the largest and likely most ancient in the range. Their durability during global heating makes them “bellwethers” for studying glacier disappearance in the western region, the study states.

Study Techniques and Findings

Scientists examined recently exposed bedrock around the glaciers and collected specimens to determine how extensively the area was blanketed by ice. They determined that the ice masses have enveloped swaths of the mountain system for much longer than earlier believed – since prior to people inhabited North America.

The state's glacial sheets attained their maximum positions as long ago as 30,000 years ago, the study's researchers wrote, and a particular of the glaciers experts studied is believed to have grown 7,000 years ago, sooner than once thought. The disappearance of ice formations, for the initial time in human history, shows the dramatic impacts of the climate change, a researcher of the study said.

Environmental and Representational Consequences

“We’ll be the first to witness the ice-free peaks,” said Andrew Jones, the study’s lead author. “This has ecological implications for flora and fauna. And it’s a representational decline. Global warming is very abstract, but these ice masses are concrete. They’re symbolic elements of the American West.”