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← GeographyWhich ecological collapse risk increases where discontinuous permafrost thaws?
A)Enhanced thermokarst lake methane production✓
B)Accelerated temperate forest carbon sequestration
C)Increased shellfish calcification near coast
D)Improved tundra soil microbial homeostasis
💡 Explanation
Enhanced methane production becomes highly likely; thermokarst formation uncovers previously frozen organic matter that undergoes anaerobic decomposition, releasing methane, a potent greenhouse gas, rather than increasing sequestration because thawed soils become waterlogged inhibiting oxygen intake. Thermokarst is the mechanism.
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