An international team of researchers found that warming on the Tibetan Plateau could trigger a self-reinforcing cycle of ancient carbon release.
This discovery is significant because such a feedback loop may act as a climate tipping point, potentially accelerating global temperature increases beyond current projections.
The study, published in Nature Communications, focused on permafrost ecosystems within the Tibetan Plateau. Researchers said that a warming increase of two to four degrees Celsius [1] could unlock ancient carbon stored deep within the frozen ground. Once this carbon is released, it contributes to further atmospheric warming, which in turn thaws more permafrost.
This process creates a dangerous cycle where the environment begins to drive its own warming regardless of external emissions reductions. The researchers said this mechanism is a primary risk to the stability of the region's carbon sinks.
The Tibetan Plateau is often referred to as the Third Pole due to its massive ice and snow reserves. The release of ancient carbon from this specific geography could have cascading effects on global weather patterns, an outcome the researchers said could be difficult to reverse once the threshold is crossed.
Because the study identifies a specific temperature range for this trigger, it provides a concrete metric for climate scientists monitoring the plateau's stability. The findings emphasize the fragility of high-altitude permafrost compared to Arctic regions.
“Warming of 2–4°C could trigger a self‑reinforcing cycle of ancient carbon release.”
The identification of a specific temperature threshold for carbon release in the Tibetan Plateau suggests that global warming targets are not just about stabilizing weather, but about preventing irreversible biological triggers. If the 2–4°C threshold is breached, the resulting carbon emissions from the permafrost could offset human efforts to reduce greenhouse gases, making the goal of limiting global warming significantly more difficult to achieve.
