Overlaid curve for annual global average temperature and atmospheric CO2 concentration. The scale for CO2 concentration runs from about 280 to about 390 parts per million. The scale for temperature runs from about 13.6 to about 14.6ºC (about 56.5 to about 58.2ºF).
Correlation between CO2 concentration and global average temperature (including geological proxy data) for the period 1000-2000 CE. For CO2 the blue points are from ice cores and the red points at the right are from direct atmospheric measurements.
© 2013 Henry Auer