We have this great world atlas book published by the National Geographical Society, which by the way, we bought at the local library used book sale for $2. Probably this low price of the book pains the Society but it sure makes my reference to maps an easy task without having to wake up my computer. The book occupies a permanent spot on a book stand in our breakfast room, standing ready to supply map information on request. The book happened to be open to the page showing the whole of Antarctica featuring all the outposts and even some commentary of scientific significance. One such comment was on ice coring data of historic temperatures and carbon dioxide content. I can understand how the CO2 content of the ice can be preserved over many centuries at varying depths, but I am unsure how the prevailing temperature of some thousand years ago can be preserved in the ice cores--but that's another issue that we will not get into here. So here is the comment on the data of the ice core