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Monday, June 1, 2020

New Studies -- Iceland Must Have Been 3°C Warmer 8,000 years ago, when CO2 levels were lower !

About 8,000 years ago, 
when CO2 levels were near 
260 ppm (415 ppm today),
ice core records suggest 
surface temperatures 
in Iceland were about 
3°C warmer than today.

Iceland’s extensive lakes 
and glaciers topography 
provides a record of the 
region’s historical climate.

Scientists can infer summer 
temperatures 3°C warmer 
than today in Iceland, 
to account for the millennia 
when glaciers “disappeared” 
from the landscape
  (Geirsdóttir et al., 2019):













A new study 
(Harning et al., 2020),
using the history of the 
Drangajökull glacier, 
also affirms the surface 
temperatures were 
about 3°C warmer 
than the late 
20th century. 
even though 
CO2 levels were 
about 150 ppm
LOWER than today


This is not consistent 
with claims that CO2 
variations are a driver
 of temperatures or 
glacier melt.











The early- to mid-Holocene 
climate was as warm, 
or warmer, than today ! 

Glacier extent was smaller, 
as a function of altitude 
and latitude, than it is today. 

The tree line 
was higher up
the mountains
than today.

A massive warming 
of land based glaciers, 
starting 20,000 years ago, 
caused a 120 meters 
  ( 400 foot ) 
sea level rise
over the next 
10,000 years.

The estimates of 
the historical
atmospheric CO2 
levels come from ice cores,
which are not disputed 
over the past several
hundred thousand years
( especially during our
current warm interglacial, 
the Holocene, over the 
past 10,000 years ).

CO2 never 
controlled 
earth’s surface
temperatures
in the past. 

A change of temperature 
always preceded the
corresponding change 
in CO2 levels, in the ice core 
records, by hundreds
 of years.