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The ice sheets in Alaska/Canada and northern Russia are around a mile thick or more and both have complete tropical forests beneath them. That means at some point in History, the sea level was at least 1 full mile lower if not more.

You have committed the logic error known to my people as the "does not follow."

Sea levels at the height of the last ice were about 400 feet lower than now, and some of the ice caps were two miles thick. I don't think a mysterious external source of water is needed to explain what happened.

Also, I haven't seen evidence that the *current* mile-thick ice-sheets are sitting on the remains of tropical forests -- can you point out a source?

Umm, you aren't paying attention to the question. You're arguing that it just exists with a mild swipe and positing that because of the theory of an ice age, we should just accept it.. I'm asking where it came from. Saying it was "just so" doesn't explain the physical model that allows it to be without destroying the planet. Where'd it come from. I'm aware of the goofy ice age theories. I'm also aware that the theories change whenever part of the theory makes someone look dumb. Note: a theory is still an opinion.