Do glaciers tell a true atmospheric CO2 story?
http://www.co2web.info/stoten92.pdf Z Jaworowski, T V Segalstad, & N Ono, 1992 227-284 Science of Total Environment ABSTRACT | INTRODUCTION | EARLY STUDIES | THE PERIOD OF HIGH CO2 READINGS | THE PERIOD OF LOW CO2 READINGS | SHALLOW CORES | DEEP CORES | MACRO- AND MICRO-CRACKS | CONTAMINATED DRILLING FLUIDS | CONTAMINATED ICE CORES | DISCREPANCIES IN DEEP CORE DATA | AGE OF AIR IN ICE | CHANGES IN THE CHEMICAL COMPOSITION OF TRAPPED AIR | LIQUID IN ICE | STRUCTURAL CHANGES AND PHYSICAL-CHEMICAL PROCESSES | CONCLUSIONS | ADDENDUM ABSTRACT Until 1985 most studies of CO2 in gas inclusions in pre-industrial ice indicated that CO2 concentrations (up to 2450 ppm) were higher than the current atmospheric level. After 1985, lower pre-industrial CO2 values were reported, and used as evidence for a recent man-made CO2 increase. The errors in these revised values, however, are of a similar magnitude to the apparent increase in atmospheric CO2 level. The assumptions used in estimating lower CO2 va
