Newshot Study Warns: Degradation of Earth's Cryosphere Is Breaching Safe Environmental Limits, Raising Risks of Sea Level Rise and Extreme Disasters
IT之家 November 15 news, according to Forbes, a new study points out that the Earth's frozen regions are degrading across the board, with key components such as ice sheets, mountain glaciers, sea ice, snow cover and permafrost all facing increasingly severe environmental risks. The researchers warn that changes in these regions are exceeding safe environmental limits and posing growing long-term threats to the Earth and its ecosystems.
The study was led by researchers at the Stockholm Resilience Centre at Stockholm University. It notes that these frozen landscapes, collectively known as the "cryosphere," play an irreplaceable role in regulating the Earth's energy, water cycle, carbon cycle and methane cycle, as well as in storing carbon.
As the cryosphere continues to degrade, problems such as rising global temperatures, sea level rise and ecosystem damage may further intensify, and the risk of catastrophic floods and droughts will increase accordingly. Polar, coastal and low-lying areas are especially vulnerable.
The study concludes that the degradation of frozen landscapes is mainly driven by human-caused climate change, with the expansion of industrial activities and infrastructure construction further exacerbating the trend. The authors call on policymakers to set precautionary targets and response strategies, limit greenhouse gas and black carbon emissions, and reduce local human interference with frozen regions.
One of the authors, Dr. Albert 诺斯特伦 of the Stockholm Resilience Centre, said in an interview that the area of sea ice and snow cover has already fallen below the safe thresholds established during the Holocene. The Holocene is the relatively stable climate period of the past roughly 11,700 years.
诺斯特伦 also noted that permafrost temperatures have risen beyond the safe operating range. Although land ice has not yet crossed the same safety threshold, the warming that has already occurred means that future ice loss will still be "substantially further."
"All four of these components have already deviated from Holocene environmental conditions and moved beyond the safe operating space," 诺斯特伦 said.
However, he stressed that the study is not intended to identify a tipping point for the sudden collapse of the cryosphere.
"Rather, it helps us assess how far the different components of the cryosphere are drifting from the environmental conditions that originally sustained their functions and helped keep the Earth stable and resilient."
诺斯特伦 said the main factors driving cryosphere degradation include rising atmospheric and ocean temperatures, as well as black carbon emissions. Black carbon reduces the reflectivity of snow and ice surfaces, causing them to absorb more solar energy and thereby accelerating melting.
The study's first author, Dr. Bo Su, a researcher at the Stockholm Resilience Centre and Beijing Normal University, said in an email that the loss of land ice, sea ice and snow cover further amplifies global warming effects while driving sea level rise and altering ocean circulation.
He pointed out that permafrost thaw releases carbon dioxide and methane, further intensifying global warming, and also leads to instability of surface structures, threatening infrastructure built on these regions.
According to IT之家, cryosphere degradation also disrupts ecological balance, especially in polar and high-mountain regions. Su said this process affects habitat stability, biodiversity and ecological relationships among different species.
He also warned that humanity may already suffer serious impacts before planetary-scale environmental boundaries are formally breached. Communities living in mountainous and polar regions are already feeling the effects of cryosphere change.
These risks are long-term, and some of the impacts are even difficult to reverse. Cryosphere losses that are already locked in will especially harm future generations.
Su described the issue as "a debt that will be passed on to the next generation no matter what choices are made today," and said it raises real questions about intergenerational equity and equity within the same generation.
Cryosphere degradation also affects species that depend on sea ice for survival. Su noted that rising surface ocean temperatures disrupt the habitats of these species, including the algae that grow on the underside of sea ice. These algae form the base of the polar marine food web.
"In short, sea level rise and changes in the marine environment are the two most far-reaching downstream consequences of cryosphere decline," he said.
Su also said that melting snow and ice injects large amounts of freshwater into the ocean, altering ocean circulation patterns and affecting seawater salinity and nutrient mixing processes. These changes cascade along the ecological chain, ultimately affecting marine ecosystems and the fisheries that depend on them.
诺斯特伦 believes that past discussions of climate stability have to some extent overlooked the importance of the cryosphere.
"We hope this study can provide a framework for the cryosphere to take a more central place in climate negotiations and climate discussions."
Dr. Zoë Thomas of the University of Southampton said in an interview that the Antarctic and Greenland ice sheets are increasingly becoming the main drivers of global sea level change.
However, she noted that other frozen regions also deserve attention. For example, mid-latitude glaciers in the European Alps, the Himalayas and the Rocky Mountains of the United States respond quickly to climate change and are therefore also regarded as "sentinels" of climate change.
"The cryosphere is a particularly important area when studying climate change," Thomas said.
She stressed that the most effective way to protect these regions ultimately comes down to reducing carbon emissions. Other measures may help to some extent, but overall, the future of the cryosphere depends on how much global temperatures ultimately rise.