Ice core data

In respect the hypothesis that human activity causes global warming, the IPCC says that “the data are now clearly presented and have very high confidence intervals.” I would like to argue that the data are not clearly presented.

The IPCC climate model is based on an empirical correlation between atmospheric CO2 content and temperature that was derived from ice core data taken prior to the year 2000. These data have a temporal resolution of 1000 years and they do indeed show a strong correlation between atmospheric CO2 and temperature going back more than 600,000 years through many ice age and interglacial cycles.

In 2004, ice core data were taken again with improved methodology and finer temporal resolution and although they still show the same high positive correlation between atmospheric CO2 and temperature, they also show that CO2 lags temperature by hundreds of years. That is to say, warming comes first and then the greenhouse gases. These data do not support the direction of causality assumed by IPCC and built into their climate model. The IPCC has chosen to ignore the new data.

Cha-am Jamal
Thailand