Which geological risk increases when thawing permafrost destabilizes boreal forest soil?

💡 Explanation

When thawing permafrost destabilizes soil, anaerobic decomposition increases because of organic matter exposure, resulting in enhanced methane production and release from thermokarst lakes. Therefore increased methane flux results, rather than coastal erosion, albedo decrease, or seismic reduction, which require unrelated mechanisms.

• Which geological feature primarily results from mantle upwelling during oceanic plate subduction?
• Which outcome results when silicate mineral weathering uptakes atmospheric CO2?
• Which outcome is caused by significant increase in pore water pressure within fault zone sediments during seismic activity?
• Which phenomenon significantly alters coastal stream flow direction during tidal shifts?
• Which mechanism limits the maximum height of volcanic arc mountains formed by subduction?
• Which outcome results when thermohaline circulation weakens near the Greenland ice sheet melt?