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Cave deposits suggest Earth experienced dramatic sea level rise 4 million years ago (52 ft)
https://www.upi.com/Science_News/2019/08/30/Cave-deposits-suggest-Earth-experienced-dramatic-sea-level-rise-4-million-years-ago/5611567187738/Previous studies have found evidence that Earth's average temperature was between 2 and 3 degrees Celsius warmer than today's climate during the middle of the Pliocene -- called the mid-Piacenzian Warm Period, which persisted from 3.2 to 3 million years ago.
"The interval also marks the last time the Earth's atmospheric CO2 was as high as today, providing important clues about what the future holds in the face of current anthropogenic warming," Onac said.
"The interval also marks the last time the Earth's atmospheric CO2 was as high as today, providing important clues about what the future holds in the face of current anthropogenic warming," Onac said.
Short of geoengineering or large-scale carbon sequestration, this is our future.