Rock weathering can counteract river CO₂ emissions induced by permafrost thaw

Rock weathering on the Qinghai–Tibet Plateau is increasing due to permafrost thaw, a process that simultaneously reduces carbon dioxide (CO2) emissions into rivers. This geological carbon flux, driven by enhanced weathering, suggests that natural carbon sequestration through rock breakdown may eventually balance or even exceed the CO2 released by thawing permafrost. The study, published in Nature on June 17, 2026, observed that as permafrost melts, it exposes more rock surfaces to chemical weathering. This weathering process consumes atmospheric CO2, effectively drawing it down. While permafrost thaw releases greenhouse gases, the accelerated rock weathering acts as a counteracting mechanism. Researchers found that the rate of CO2 consumption via weathering is significant enough to potentially offset the emissions originating from the thawing permafrost itself. This finding highlights a critical feedback loop in the Earth's carbon cycle, where warming-induced permafrost degradation can trigger geological processes that mitigate its own climate impact. The implications are substantial for understanding future carbon budgets and the long-term effects of climate change on Arctic and alpine environments.