Discussion
All of the following are sources of uncertainty in a climate projection EXCEPT
Answer: C
Correct answer: the value of the gravitational constant
The gravitational constant is known to many significant figures and is not a source of projection uncertainty at all. The three genuine sources are the ones listed, and they are of quite different kinds: how the model represents feedbacks, the unforced internal variability of the system itself, and the future path of emissions - which is a matter of human choice rather than of physics.
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