The slope change happened about 6,000 years ago. Been the same ever since. Nothing to see here.Wrong.
When the ice age glaciers were here, the ocean levels were so low that the Black Sea, and the Dead Sea were dry.
The Mediterranean Sea was 390' lower than it is now.
{...
(Modern research has shown that Wells' theory is incorrect. All the geological and plant-fossil evidence shows that the Mediterranean did not dry out during the last ice age. Sea levels were 120 m (390 ft) lower than today, resulting in a shallower Strait of Gibraltar and a reduced water exchange with the Atlantic, but there was no cut-off.)
...}
Messinian salinity crisis - Wikipedia
en.wikipedia.org
But right now we are supposed to be in a cooling period, and water level is supposed to be dropping again, NOT rising.