I have often wondered how ocean levels could dramatically rise with the melting of ocean icebergs, since frozen water is less dense than sea water.
Greenland and Antarctica have mostly land borne ice. So, if they melted, there would be an increase. Of course Antartica has WAY more ice. (BTW, temperatures in Antartica have been declining since 1955.)
Although even if they were to rise, there would be a ways to go before the ice would start to melt. Annual mean temperature is below -10 cel. for all of Antarctica! (-60 cel. at the pole, brrrr...)
The polar ice cap can’t raise sea level since it is already in the sea. The argument is based on the belief that if the polar ice cap melted, land based glaciers would also melt. The glaciers on Greenland would cause a sea level increase of several feet if this happened.
The argument fails for two reasons.
First, the glaciers aren’t melting. Studies of glaciers indicate that some are getting bigger and some are getting smaller.
Second, if the glaciers melted, the sea level would rise over populated coastal areas, but unpopulated frigid areas would become habitable. Alaska, Greenland, Northern Canada, and Siberia are vast expanses of land that would be habitable if not for the ice sheets.
While we’re at it, global warming liars (formerly alarmists) claim that the increase in temperature would result in more tropical cyclones and more storms with tornadic activity in the United States. Then they claim that global warming will cause droughts. Of course, it can’t happen both ways. If there is more rain, there will be fewer droughts. Increased rainfall also suggests that deserts would receive more precipitation, which would make the land usable.
Actually - the water level wouldn’t change 1mm. Ice displaces the volume it consists of. Now if the Iceland and Greenland Ice sheets melt completely - that would be something impressive - and add a few inches to sea level.