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. 2008 Aug 26;105(35):12774–12779. doi: 10.1073/pnas.0806099105

Fig. 3.

Fig. 3.

Two charts illustrating the need for caution about changes in energy and carbon emission as affluence A increased. (Upper) The differing U.S. courses of energy intensity of impact T calculated from CDIAC, IEA Reference (Ref) and Sectoral (Sect) reports (1980 to 2004), and from DOE reports (1980 to 2005). (Lower) For China after 1980, the courses of energy intensities of use C to 2006 and of cement intensities to 2005 and of intensity of impact T to 2004 calculated, with and without emission from cement production. DOE data extended 2005/2006 with BP reports (13–16, 19–22).