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PREDICTIONS – 10 Years Later - Santa Fe Institute

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APPENDIX C<br />

ANNUAL ENERGY CONSUMPTION GROWS TO FILL A NICHE<br />

Quadrillions of BTUs<br />

150<br />

<strong>10</strong>0<br />

50<br />

0<br />

1850 1980 21<strong>10</strong><br />

APPENDIX FIGURE 8.1 Data and S-curve fit on annual energy consumption in<br />

the United States. Energy is expressed here in quadrillions (one thousand million<br />

million) British Thermal Units (BTUs.) One BTU is the quantity of heat<br />

required to raise by 1 o Fahrenheit the temperature of one pound of water. The<br />

small circles show excellent agreement between the forecast and the actual data<br />

since 1985. ∗<br />

∗ The data come from the Historical Statistics of the United States, Colonial Times to<br />

1970, vols. 1 and 2, Bureau of the Census, Washington, DC, 1976, and from the Statistical<br />

Abstract of the United States, U.S. Department of Commerce, Bureau of the<br />

Census.<br />

3<strong>10</strong>

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