But some of the floods from the Laurentian Ice sheet, itself kilometers thick, were pretty huge. Some studies of the flooding of Doggerland (https://en.wikipedia.org/wiki/Doggerland) was of the sea rising very fast, enough to noticed in months.

Glaciers don’t just melt from above, they melt from below, as surface melt sinks to the bedrock. There, it doesn’t just melt the ice above, it lifts it. Hydrostatic lift. Not lubricate the bedrock ice interface, lifts the glacier up. And there are huge pockets of water under that ice right now.

The old Mile High Stadium in Denver could convert from football to baseball by moving a huge structure on a thin film of pressurized water. (https://www.thedenverchannel.com/sports/broncos/when-mile-high-stadium-floated-on-water-the-broncos-old-home-transformed-in-hours).

But Greenland will collapse first.

The Arctic ice, OTOH, is only a few feet thick. It could all be gone in one hot summer, and it may be permanently gone in just a few decades. The Arctic also has a much greater effect on the N hemisphere than Antarctica has on the S.

And if the Arctic ice melts, the summer sun will heat up the Arctic Ocean so much it may never come back.

The Antarctic scares me, I’ll be honest, when it comes to climate change. More so than the Arctic. Maybe not in the remaining years of my life, but the way things are going, the ice cap will collapse. And the effects will be observed over months, not decades.

In summer, 2012, there was a catastrophic collapse of summer Sea Ice Extent in the Arctic, and some climate scientists felt the end of the world was upon us. It turns out the anomalous extreme dip was due to a combination of circumstances, due to local and short term weather, current and sea state. Sep 2012 still has the record. Since then, there has been no lower SIE. The denialists seized on this in order to discredit the entire idea.

Of course, if you look at the data over time, the trend is obvious. I won’t get ambushed by those scumbags again.

https://nsidc.org/arcticseaicenews/files/2021/10/Figure-3-sept2021-388×300.png

For a more detailed look, use this:

https://nsidc.org/arcticseaicenews/charctic-interactive-sea-ice-graph/

There is an extensive discussion of this at nsidc.org. Yes, there is global warming, but it seems to affect the Northern Hemisphere more than the South. Unfortunately, that is where most of the land, and the people, are.