View source for File:Figure 3.5 - Change in average global temperature over the last 80 million years.png

Change in average global temperature over the last 80 Ma. The temperature curve of Crowley and Kim (1995<ref name="Crowley and Kim, 1995">Crowley, T.J. and Kim, K. 1995. Comparison of long-term greenhouse projections with the Geologic Record, ''Geophysical Research Letters'', '''22''', 933-936.</ref>) is modified to show the effect of the methane discharge at 55 Ma (Zachos et al., 2003<ref name="Zachos et al, 2003">Zachos, J.C., Wara, M.W., Bohaty, S., Delaney, M.L., Petrizzo, M.R., Brill, A., Bralower, T.J. and Premoli-Silva, I. 2003. A Transient Rise in Tropical Sea Surface Temperature During the Paleocene-Eocene Thermal Maximum, ''Science'', '''302''', 1551-1554.</ref>; Zachos et al., 2005<ref name="Zachos et al, 2005">Zachos, J.C., Rohl, U., Schellenberg, S.A., Sluijs, A., Hodell, D.A., Kelly, D.C., Thomas, E., Nicolo, M., Raffi, I., Lourens, L.J., McCarren, H. and Kroon, D. 2005. Rapid Acidification of the Ocean During the Paleocene-Eocene Thermal Maximum, ''Science'', '''308''', 1611-1615.</ref>). The future rise in temperature expected from energy use projections shows the Earth warming back into the &lsquo;greenhouse world&rsquo;(from Mayewski et al., 2009<ref name="Mayewski et al, 2009">Mayewski, P.A., Meredith, M.P., Summerhayes, C.P., Turner, J., Worby, A.P., Barrett, P.J., Casassa, G., Bertler, N.A.N., Bracegirdle, T.J., Naveira-Garabato, A.C., Bromwich, D.H., Campbell, H., Hamilton, G.H., Lyons, W.B., Maasch, K.A., Aoki, S., and Xiao, C. 2009. State of the Antarctic and Southern Ocean Climate System (SASOCS), ''Reviews of Geophysics'', '''47''', RG1003, doi:10.1029/2007RG000231.</ref>).
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