[cogitator]

What are the CO2 estimates over the past 25 million years? (180 ppm to 380 ppm) What are the temperature estimates? (-5.0C to +4.0C) The doubling estimates do not work at this time scale nor any timescale in the historical climate.

I'm breaking silence because I don't know where you got your CO2 (atmospheric concentration) estimates. The first paper's pretty easy to read on this.

Linkages between CO2, climate, and evolution in deep time (PDF)

Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene (abstract only)

but you can download it here

[JustDoItAlways]

You can get the data for these two papers at this link (along with others you might want)

http://www.ncdc.noaa.gov/paleo/forcing.html

scroll down to the “Atmospheric Trace Gases” section and they are provided in Excel spreadsheet form and then one can reorganize it to plot CO2 versus time.

This one also has the CO2 numbers published in IPCC AR4.

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/ipcc2007/ipcc2007fig61top.xls

[JustDoItAlways]

Sorry, should have mentioned you can ignore the Pedogenic Carbonates CO2 data since it is just a bunch of outliers including lots of 0’s.