Antarctica
Once again, evidence of times in the past long before the industrial era when warming similar to or in excess of the present ‘crisis’ conditions occurred in a polar region. Natural climate variation is the norm.
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Studying the response of Antarctic ice sheets to past warming episodes is essential to understand how they may respond to the present warming climate, as their melting and collapse can contribute to global sea level rise, says Phys.org.
Detailed records of past ocean temperatures close to the continent are rare, but clues to how ice sheets and sea ice responded to global conditions in the past can be found in funny places—even in the remains of animals that once lived there.
A study led by the University of Maine used the presence (and eventual lack thereof) of elephant seals to illustrate how the area transformed in a warm period…
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Climate Collections 
It’s worth noting that year-round polar icecaps are rare in Earth’s history. Over the 3.5 billion years since carbon-based life forms evolved, less than 1% of that time has Earth had year-round polar icecaps. Only during the coldest portions of Ice Epochs within Ice Eras are conditions conducive to year-round polar icecaps. Yet most people believe the year-round polar icecaps are a fixture of planet Earth. They are not. Perspective is important. Cooling will come. Warming will come. But when they do, they will have nothing to do with atmospheric CO2. Long ago (prior to 3.5 billion years ago), CO2 maxxed out its meaningful impact on climate. It never really had a meaningful impact on climate change which is vaxtly more complex and determined by vastly more powerful factors (solar variations, orbital variations, axial tilt variations, geologic plate tectonics, etc.).
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