Increased methane release occurs when enhanced thermokarst causes which process?

💡 Explanation

Abrupt thaw degradation in permafrost regions releases large amounts of previously frozen organic matter; microbial decomposition accelerates due to thaw, via methanogenesis. This overwhelms natural carbon removal, because the exposed biomass decomposes much faster at higher temperatures, therefore methane release exceeds carbon sequestration rates.

• Which outcome occurs when intense rainfall weakens soil above karst?
• Which cave formation increases when soluble rock dissolves?
• Which consequence results when accelerated limestone pavement dissolution occurs?
• Which outcome increases when constructed river levees cause channel incision?
• Which outcome results from reduced bioturbation during soil pedogenesis?
• Which risk increases when differential erosion affects coastlines?