AP Environmental Sciencemediummcq1 pt
Permafrost thaw accelerates warming because
A.thawing releases stored methane and CO₂
B.it reflects more sunlight
C.it stores extra carbon
D.it cools the Arctic
Explanation
Core Concept
Frozen organic matter decomposes as it thaws, venting carbon that adds to warming, which thaws more permafrost — a dangerous positive feedback.
Correct Answer
Athawing releases stored methane and CO₂
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