Discussion
Climate variability differs from climate change in that variability
Answer: A
Correct answer: refers to fluctuations about a fixed mean
Variability is the natural swing of the system around its mean state - a warm year, a cold decade, an El Nino - and it occurs whether or not anything is forcing the climate. Change is a shift in the mean itself. Both are present in any real record, which is why separating them is the whole business of detection.
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