Can you explain? The Arctic Ocean and the Southern Ocean are both physically connected to the Atlantic and Pacific Oceans. In what way do you believe they are thermally isolated? And why weren't they thermally isolated in the past? And when did they transition from unisolated to isolated? You mentioned 50 million years, but what about the previous 3,450,000,000 years? How was the planet configured during the other 98.57% of its existence ?
Then I'm asking you to get me up to speed. Please explain how all this isolation and unisolation has led to the radical warming we've seen in the last 150 years and why the CO2 has nothing to do with it.