Which of the following positive feedback effects is NOT a result of Arctic thawing and glacial melting?
a. Melting sea ice leads to less reflectivity.
b. Melting permafrost leads to released methane gas.
c. Melting of the sea-floor results in release of methane hydrate.
d. Melting permafrost leads to increased photosynthesis.
e. Melting glaciers leads to exposed darker rock.
ANSWER: d
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