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Sustainability 2011 , 3 1878

Figure 7. Sensitivity Analysis for indirect energy consumed by the U.S. oil and gas industry.

Figure 8. Sensitivity Analysis comparison with the independent analysis of O’Connor and

Cleveland. Note that the values for O’Connor and Cleveland do not exactly match those in

Table 7, as that table simply shows the effect of the three most significant differences in

methodology. Several other minor differences also exist.

0

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1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 2010

Peta Joules

Ye a r

8.3 MJ/$

20 MJ/$

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EROI

Ye a r

Guilford & Hall

O'Connor & Cleveland

14

MJ/$

G