On Wednesday, January 15, 2020 at 10:37:47 AM UTC, Spike wrote:


The Roman Warm Period? The Medieval Warm Period? But in those times
atmospheric CO2 was lower than at present, meaning crops, etc, would be
poorer. But humankind survived that heating of the planet.

I expect the data-collectors of the group could easily say how far south
from, say, the environs of Stoke-on-Trent one would have to travel to
experience a 1.5degC increase in the climate - I'm guessing somewhere
as far as Salisbury or Chichester.


--
Spike

We have already surpassed the warmth of the MWP. I have a vague recollection of HH Lamb (Climate History and the Modern World, and the previous 'Climate' book) referring to it being 0.7C warmer than the coldest part of the C20. The difference is that we have warmed so quickly this time. Some people kept reading those sources for too long into the current warming period. It is nice to keep textbooks but we have to be careful as the details can become out of date.

Spike, you attach a great significance to the MWP and the LIA - neither were truly global phenomena in the sense of the current global warming crisis.

PS if you were confident in your assertions, would you not identify yourself?

Julian Mayes