We Have Not Yet Established the Impact of Solar Variability

We have not yet established the impact of solar variability on the Earth's climate system because:

A) we have no way of measuring solar variability directly.
B) most scientists now agree that solar output is constant and does not vary.
C) satellites have not yet been around long enough to provide a data set of adequate length.
D) it is not a legitimate enough theory to gain much attention from the scientific community.

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