"While no paleoclimate is the perfect analog for the future, there is a greater likelihood that the equilibrium future climate will bear more in common with the Miocene than with either the Pliocene or the Eocene." What did that look like? A thread (1/x) agupubs.onlinelibrary.wiley.com/doi/full/10.10…
"Miocene conditions have proved difficult to reconcile with models. This implies either missing positive feedbacks in the models, a lack of knowledge of past climate forcings, or the need for re-interpretation of proxies, which might mitigate the model-data discrepancy."
"During the Miocene, including the Miocene Climatic Optimum, most proxy records indicate that pCO2 was near or moderately higher than modern values."
"The MCO was ∼7°C–8°C warmer than the modern world and no Miocene climate model simulation has so far reproduced that kind of warmth at less than 800 ppm, considerably higher than reconstructed pCO2."
"On land during the early and middle Miocene much of the Earth was heavily forested, and these forests extended to much higher latitudes than today. Trees grew around the Arctic and even on Antarctica in sheltered areas, while humid subtropical forest flourished in Iceland."
"Key subsystems of our modern Earth had evolved and stabilized by the late Miocene, including but not limited to..."
"the East Antarctic Ice Sheet; the AMOC; perennial Arctic sea ice; stronger monsoon systems; the El Niño Southern Oscillation; the tundra/permafrost biome; widespread grasslands and their ecosystems; as well as modern-type forests, deserts, and their affiliated ecosystems."
"That these Earth system components, many of which are now viewed as 'vulnerable' to anthropogenic climate change, switched on at this time, implies they have their 'tipping points' in the Miocene temperature/pCO2 zone." (X/x)
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