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This shows the rise in temperature in degrees centigrade (second column) of the earth from the 1860 figure as a function of time since 1900. Data from "Applying Mathematics" by D.N. Burghes, I. Huntley, and J. McDonald, Ellis Horwood 1982, page 175.

1st col	2nd col
1900	0.03
1910	0.04
1920	0.06
1930	0.08
1940	0.10
1950	0.13
1960	0.18
1970	0.24