Der CO2-Gehalt im vorindustriellen Zeitalter betrug 275 – 284 ppm.
Quelle: Etheridge, D. M., Steele, L. P., Langenfelds, R. L., Francey, R. J., Barnola, J. M., & Morgan, V. I. (1996). Natural and anthropogenic changes in atmospheric CO2 over the last 1000 years from air in Antarctic ice and firn. Journal of Geophysical Research: Atmospheres, 101(D2), 4115-4128.
Jahr: 1996
Land: Global
