Last time CO2 levels were this high the sea was 25 meters higher & globe 2-3 degrees warmer: so why hasn't that happened this time?

'The last time scientists believe it may have been this high was 2.5 to 5 million years ago during the Pliocene epoch, when sea levels were 25 meters higher than today and global temperatures were warmer by 2-3 degrees Celsius.'
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