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← GeographyWhich outcome occurs when permafrost thaw increases methane seeps near thermokarst lakes?
A)Atmospheric methane concentration will increase✓
B)Silicate weathering rates will dramatically increase
C)Lake water salinity will rapidly decrease
D)Regional tectonic plate subsidence accelerates
💡 Explanation
Increased permafrost thaw causes more methane to be released via ebullition; because the warming accelerates decomposition, the greenhouse gas flux will increase. This enhances the initial warming signal, rather than changes in salinity or weathering, which have slower timescales.
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