Which feedback results when thermokarst lake permafrost thaws?

💡 Explanation

Increased thawing of permafrost near thermokarst lakes amplifies methane production via microbial decomposition. This induces a positive feedback loop because methane is a potent greenhouse gas, therefore warming accelerates, rather than initiating plant growth driven carbon sequestation.

• Which outcome results when basal sliding accelerates in cirques?
• Which outcome is least likely as deposition shifts laterally on an alluvial fan constrained by uplift?
• Which outcome accelerates leaching by rainfall in loess deposits?
• Which consequence results near the coast when excessive groundwater extraction destabilizes karst?
• Which outcome is initiated when excessive pyroclastic material accumulates?
• Which phenomenon shapes lake basins fed by glacial meltwater in previously glaciated landscapes?