The Earth’s history is very revealing on solar activity and our climate, less activity on the Sun results in "Global Cooling" and more activity results in "Global Warming". Somehow this simple rule of "thumb" has not made an appearance to those people directly involved with "Man Made Climate Change" (MMCC).
And here is the reason why.
In times of low solar activity the Earth has more "dust" in its atmosphere, the MMCC analysis show this as a spurious "coincidence". The principal climate scientists go on to say that volcanic "dust" was the reason behind times of “Global Cooling” and not the coincidental low solar activity.
This is what they say about the Dalton Minimum period from 1790 to 1839, during this time there was extra volcanic activity, and the dust from the eruptions reduced the effect of the Sun on the Earth.
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