Dante's Inferno looms ...

 

Modelling of mean surface temperature, precipitation and precipitation-evaporation budgets according to pre-Industrial levels through to worse-case scenarios of carbon dioxide levels nine times that of pre-Industrial conditions. Credit: Cramwinckel et al. 2023

GW, the gift that keeps on gifting, has run amok several times in Earth's history with the greatest heat-up conjectured to have occurred around 56 million years ago, an era known as the PETM, the Paleocene-Ecocene Thermal Maximum, where CO2 concentrations rose above 1000 in ramping up temps15C warmer than today, thus rendering large parts of the world uninhabitable during the PETM  for a period lasting from 20,000 to 50,000 years. 

Climate change during the last 65 million years as expressed by the oxygen isotope composition of benthic foraminifera. The Paleocene-Eocene thermal maximum (PETM) is characterized by a brief but prominent excursion, attributed to rapid warming. Note that the excursion is understated in this graph due to the smoothing of data.

Researchers hypothesize there were no clouds during the PETM
due to the intense injection of CO2 into the atmosphere.

Processes responsible for the cloud deck breaking up around 1,200 ppm CO2 in the model.
 Temperatures shown in units of kelvins.

The Early Eocene Climatic Optimum (56–48 million years ago) was one of the warmest intervals of the last 66 million years, with mean global surface temperatures over 14°C warmer than present. Atmospheric carbon dioxide levels were elevated to >1,000 parts per million (ppm; by comparison modern levels are ~400 ppm) and mean sea surface temperature was up to 16°C warmer than pre-Industrial temperatures, while latitudinal temperature gradients (the temperature difference between the equator and poles) peaked at 22°C. Intergovernmental Panel on Climate Change (IPCC) reports predict that Eocene climate could be reached by 2100, under worse-case scenario models.

Note, this was when the world was NOT POLLUTED nor was there habitat loss prior to the PETM event.

Canto I from the Inferno, the first part of the Divine Comedy by Dante Alighieri

Inferno (Italian: [iɱˈfɛrno]; Italian for "Hell") is the first part of Italian writer Dante Alighieri's 14th-century epic poem Divine Comedy.