What happens to air pressure if the ice caps completely melt?

Apologies; it just didn't seem like an appropriate question for Earth Science or Biology. Let me know if I'm incorrect. Maybe Physics?

If all the ice, permafrost, ice caps, etc. melted due to global warming, and became water, would there be a significant, or even deadly (to us) change in the pressure of the air? I kind of recall something like this was what allowed larger animals to thrive millions of years ago.

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What happens to air pressure if the ice caps completely melt?

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