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If you read the whole thing, Brian Fagan's book and perhaps Diamond's might interest you. The basis for the 180-280 ppm window is the Vostok ice core data going back 640,000 years when CO2 was never out of that range (and it encompassed the full glacial-interglacial climate range).

Although I consider myself literate in most of the sciences, I must defer to the experts-without-an-agenda on this.

When were the vostok cores gathered and for what purpose?
Aren't these the ones that were demonstrated to be totally useless because they were not specifically gathered to measure gases with the proper safeguards to prevent almost certain contamination?

As I recall, a rspected member of the Russian Academy of Sciences wrote a comprehensive analysis on this subject.

When were the vostok cores gathered and for what purpose?

Research, I believe.

Aren't these the ones that were demonstrated to be totally useless because they were not specifically gathered to measure gases with the proper safeguards to prevent almost certain contamination?

I believe that a few threads ago you posted me a "research" paper on the validity of the Vostok ice core data. I don't know if I posted back to you a massive, comprehensive refutation of it. If you can find the link again, I can do the search I did then, and post the refutation back to you.

The bottom line is that the "attack" on the Vostok ice core data is baseless.