Paleoclimatology helps us understand the past (pictured)

If we are unable to stem the CO2 emission trajectory we are on and at the SAME TIME find a way to remove what is already in the atmosphere (420 ppm) we are going to be going through some things - if the Mid-Pliocene is anything to go by.

Temperatures then were 2.5 to 4°C warmer relative to 1850-1900 and sea levels above 5m relative to 1900 - this all at CO2 concentrations between 360 and 420ppm.

Best we mentally prepare for major disruption to everything we have known.