buzsaw
Using logic and reasoning all I can offer as a layman is that a greenhouse canopy type atmosphere would have had different properties than ours which would likely affect the whole ecosystem of the planet which in turn would likely render modern dating methodoly inaccurate.
That is the trouble with layman logic and reasoning buz. It tends to miss out on a lot of information that would allow it to not make mistakes concerning such issues in the first place.This is currently off topic to the thread, however, I will point out to you that radiometric dating is not affected by environment nor chemistry and temperature. You're natural skepticism is, in this case, mistaken.
Half-life effects are a result of events occurring to the nucleus as a result of disintegration of the nucleus through different types of decay. The events you describe deal with events that occur through the electromagnetic force and do not affect the radioactive half life.
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