17. Although the earth appears to be warming now, recently past events were warmer than the present one. See slide 18 for example.
Bluemle, John P., Joseph Sable, and Wibjorn Karlen, 2001, Rate and Magnitude of Past Global Climate Changes: in, Gerhard, Lee C., William E. Harrison, and Bernold M. Hanson, eds., 2001, Geological Perspectives of Global Climate Change: American Association of Petroleum Geologists Studies in Geology #47, Tulsa, OK, p. 193-212.