Hi dehammer,
I quite agree with your last post but only as far as it goes.
Plant records for this Ice Age are quite difficult to obtain. Further back it only gets worse.
Just as with fossil records, what we have left is only fragments. Certain plants certainly suggest the CO2 levels and relative climate of an area but it is quite hard to get that for the whole world. The best you can use this for is trends. What it does not tell you is that 1.2 million years ago the average world temperature was 14.6 degrees or any other temperature for that matter.
Since we are arguing about fairly small changes for supposed man made effects on climate, the available evidence of the past geologic periods tells us nothing except general trends imho, especially if you are attempting to provide a world picture.
