Sea going down and up at the same time.

While alarmists sound the climate klaxons, sea and land go up and down  to their own tune.  Look at this chart off the Chesapeake coast of America.  Subsidence and rise of sea relative to land are everywhere and satellites tag it.  The blocks of land we inhabit are rafts bogged into moving molten muck with seawater sloshing around the crannies and hollows as stuff moves about.

Crater, page 20 of Chesapeake report.

Distrust ecopoliticians painting good and evil on a simple canvas.  The earth is still rebounding from the recent ice age as a mile thick layer of ice melted from Canada.  Ten thousand years ago, native people were migrating from the Prince Rupert area (through what is now the 100 ft deep Hecate Strait) to the Queen Charlotte/Haida Gwai area on foot.  Tectonic plates are grinding into each other and slipping past as one rises and one falls.   The study referenced by the chart even found a hitherto unknown but enormous meteor impact by the mouth of Chesapeake Bay which is still altering the land's response to the sea.   Worldwide you can see drowned coastlines (like the fjords of Norway and the west coast of BC) and emerging ones with lazy deltas and flats.  Not that long ago, the Thames and the Rhine emptied into the same bay and the settled areas of Doggerland in the North Sea (once the heart of Europe) subsided below the sea.

These maps are modern history since the last ice age.  The old landscape has been re-charted
under the mud of the North Sea and many artifacts of early settlement turned up.

Give me a gigantic break from THE-SEA-IS-RISING-THE-SKY-IS-FALLING alarmism.  How sea and land levels alter is a good topic of study and may even someday be well quantified.  That day is not yet.