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It has been measured empirically since 1957 and has been rising through the entire record. Proxy records show that it has been rising for at least 150 years.
Vostok records show a gain for the past 10,000 years.
The interesting issue here becomes one of who you should believe on the subject.
No one is doubting that CO2 levels have been rising for the past 30 years. Longer term though starts getting far more gray.
The "norm" from thousands of observations made in the 1800's showed CO2 levels at 400 PPM to even as high as 440 PPM in the late 1880's.
Vostok records show climbing levels of CO2 always following temperature by about 800 years. Thus we see steady climbing for 10,000 years.
Alarmists use Vostok records for historical data. They compare these values with global averages for recent times. Under this method we see CO2 growth of 30% Antarctica compared to worldwide. (Antarctica to Antarctica shows far less growth, almost zero)
Skeptics point out that the average measured in the 1800's was about 400 ppm, with times showing over 440 ppm. These measurements were performed by noble prize winning scientists.
We KNOW that current worldwide averages are about 387 ppm. (Less at the poles)
The net result is that are current knowledge of CO2 rise is somewhere between a slight decrease from 1880 to a 30% increase, depending on how, who and where we get the data.
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