@layman,
Moore presents a lot of information pertaining to periods consisting of many millions of years. This guy had dedicated his academic training and his entire life to studying and learning such "information." I am in no position to assess just how accurate any of it is.
But it sounds plausible, and his basic points are easy enough to understand. For one thing he says (and I have seen many other experts make the same claim) that atmospheric CO2 is a lagging, not a leading, indicator of rising or lowering temperatures. If it gets warmer, you may get more CO2, and there may be a relationship between the two. But CO2 doesn't "cause" the increased temperatures (although it may enhance the effect). Something else causes the increased temperatures FIRST.
I have seen many other factors, such as solar activity and the position of the earth in it's eccentric orbit, ocean currents, water cycles, cloud formation, etc., being asserted by experts as having a much greater affect on global temperatures than the amount of "human-caused" CO2 in the atmosphere.
I can't pretend to know the answer. Moore quotes the IPCC itself as saying the factors are too complex to be amenable to predictability, and I have my self quoted IPCC lead writers (and others) who assert that there is a high degree of uncertainty about it all. I can't help but believe that much.
So where does all this putative "settled science" come from? I already cited a peer reviewed paper which examined the data and the math underlying the commonly referred to "97% of all scientists agree" claim. That paper said that, when properly calculated, it was not 97%. It wasn't 10%. It wasn't 5%. It wasn't even 1%.
It was less than 1/3 of 1%.
So again, one has to ask--why are we always hearing about this great consensus pertaining to the alarmist propaganda? What it the source of this, and what is the motive behind asserting it?