I think you're missing the science.
An iceberg is a floating lump of ice, once it's floating, it can no longer change the sea level, even if melted.
This is essentially different to a glacier that sits on land.
I thought it was us right wingers that weren't educated?
Same for the Arctic ice cap, it's floating so won't affect sea levels if it melts.
Antarctic is ice on top of a continent, so it will affect sea levels if it melts.