Permafrost thresholds nearing irreversible collapse

Climate scientist warns permafrost thaw could trigger unstoppable carbon release by 2100

Professor Gustaf Hugelius of Stockholm University identifies permafrost regions as a critical climate risk. These areas—covering 20 million square kilometers (five times the EU’s size)—store 1,500 gigatons of carbon, equivalent to three times Earth’s living vegetation. If global warming reaches 1.8°C–3.6°C by 2100, permafrost thaw could release 200–300 gigatons of CO2 equivalents. Thawing landscapes emit methane (30x more potent than CO2 short-term) when wet and carbon dioxide when dry, creating permanent thermokarst features that release carbon for centuries without refreezing. Northern Sweden and Finland have already crossed irreversible permafrost thresholds despite current climate stabilization efforts.

This threatens irreversible climate feedback loops that accelerate global warming beyond control. Permafrost thaw acts as a self-reinforcing system: once landscapes become wet, methane emissions intensify, further warming the region. The risk is particularly acute as local tipping points may occur before global temperature thresholds are reached.

This friction undermines climate stability—a foundation for all basic needs. Without stable temperatures, the systems supporting food, water, and energy security become increasingly vulnerable. The 2026 date in the source appears to be a typographical error; current warming scenarios apply specifically to 2100. What to watch: whether regional permafrost thresholds trigger before 2100, as this could accelerate carbon release far beyond current projections.

Source: Guardian