Hentet fra Puste: En grønn lunge i bloggsfæren, som oppgir følgende kilde:
Kilde figurer: Steffen W, Sanderson A, Tyson P D, Jäger J, Matson P, Moore III B, Oldfield F, Richardson K, Schellnhuber H-J, Turner II B L and Wasson R J (2004) Global Change and the Earth System: A Planet Under Pressure. The IGBP Book Series, Springer-Verlag, Berlin, Heidelberg, New York. Via New Scientist (her finnes også referanser til originalkilder for hver av figurene).Sistnevnte skriver:
The two sets of graphs ... illustrate how human activity has changed since the beginning of the Industrial Revolution, and the impacts that our societies have had on the Earth as a whole.
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