That is why climate scientists have been trying to change the phrasing to "Climate emergency". It is not a shift in seasonal changes, summers will get warmer, also.
Do you honestly believe that the cause of a 5-10C average in Feb/March is not due to a shift, but will actually materialize into +10-20F average over this Summer?
The climate of the Cretaceous is less certain and more widely disputed. Probably, higher levels of carbon dioxide in the atmosphere are thought to have almost eliminated the north-south temperature gradient: temperatures were about the same across the planet, and about 10°C higher than today.
That is astonishing. Imaging how much energy takes to warm your home 10°C, how much more will take warm a museum or a stadium. Now apply that to the entire planet. Storms in the Cretaceous were probably no fun with so much extra energy.
I could be wrong, but a more homogenous temp across the globe seems like it would result in milder storms. Since temperature gradients account for a lot of storm activity.
Solar radiation intensity has been increasing gradually since the earth was formed. Current sun intensity may not allow for the same CO2 concentrations that earth tolerated in prehistoric times.
