7. Analysis of ice core data from Antarctica by Indermühle et al. (GRL, vol. 27, p. 735, 2000), who find that CO 2 lags behind the temperature by 1200±700 years.
12. Annual Mean Surface Air Temperature Change, 1971–1990 to 2041–2060 Figure 7.29
13. An interesting experiment is going on in Nevada to test what might happen with plant growth under increased CO 2 FACE – Free Air CO 2 Enrichment experiment on the Nevada Test Site.