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1) I don't understand how anyone can conclude that life was uniform pre-flood to what is post flood as per the Biblical record. Surely you are aware that as per the Biblical record, men lived as long as 9+ centuries and that after the flood that life quickly digressed from 6 to 9 hundred years down to 300, then 200 and by the time of Moses, down to under 200 and that larger animals such as mamoths and dinos lived on the earth? If that be the case, then there had to be factors which would affect dating methology.
It's really, really simple. The fact is that aside from the dubious claims of long lifespans (which tell us nothing about the atmosphere even if true, and continue into post-Flood times anyway) there is NO difference. We have ravens and doves and whales. We have trees and grain. We have rivers and mists. In short there is absolutely nothing to suggest any significant difference in the atmosphere.
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2) The unique Buz hypothesis is in some respects, more compatible with the mainline science view than that of most fundi creationists.
Even if that were true, it is hardly relevant because we are talking about what those "fundi creationists" say". Or rather your vague- and likely incorrect - idea of what they say (amazingly you can't even be bothered to find THAT out)
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3) Science could only speculate on the properties of a pre-Biblical flood atmosphere and chemical makeup of earth's surface, etc, since the data would not be uniform to the the view which science has studied.
How exactly does that work ? Is the air trapped in the icecaps going to magically change in composition so that it looks like the current atmosphere ? A different atmosphere wouldn't change the laws of chemistry so we can look at the rocks - and less directly we can look at fossils - and see what they tell us. (We can tell, for instance that carbonate shells were viable - which limits how acidic the seas could be and that tells us about the atmosphere). Even in the most extreme YEC scenarios many fossils are of pre-flood life.
Let us be clear. You DON'T know what creationists propose. You DON'T know if the proposed atmospheres would leave evidence or not. That sort of
musing doesn't seem like something that is really worth posting here. If you followed it up and found a serious proposal that would be both undetectable and make some sort of relevant difference to the pre-Flood world then that might be worth discussing. But a wild guess about the significance of ideas you can't even be bothered to look up ? What's the point of that ?