Flame — HabitableZone

Flame » in reply to re: try "On the Influence of Carbonic Acid in the Air Upon the Temperature of the Ground", Philosophical Magazine 1896(41): 237-76)

When

CO2 has been "accurately" measured at many times. Just the standard of acuracy has improved with time.

Also, these days we can get real smart and measure CO2 content of trapped gas in ice cores and measure actual* atmospheric CO2 dating back over the last 400,000 years or so...

http://www.daviesand.com/Choices/Precautionary_Planning/New_Data/
http://www.ncdc.noaa.gov/paleo/icecore/antarctica/vostok/vostok_co2.html

*actual, once corrected for subtle burial effects, of course.

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