No-one knows how the centuries-long waxing and waning of the Sun works. However, astronomers now have space telescopes studying the Sun in detail.
This sentence really encapsulates the basic flaw with the entire man-made global warming supposition. Earth's climate is very complex with elements of atmosphere, inner earth dynamics, ocean movements and sun activity playing a role. To what extent we can measure or control or manipulate to achieve a desired effect is unknown.
The bottom line is that we have no idea what we can do to make the earth warm or cool with any certainty by implementing man-made activities. At this point, all we know for sure is that we might make it better, we might make it worse, or we might have no effect.
Absolutely correct. Science really is still in its infancy across almost all disciplines.
Excepting the soft sciences which are designed for infants.
They preach it.
They demand that it be taught.
They insist that it is a fact.
But when it comes down to brass tacks, they don't believe a word of it.