ABSTRACT
Figure 4.1 shows the energy and percentage of use for various fuels in the U.S. The U.S. consumed 29 quads in 1949 and 83 quads in 2002 (1 quad
=
Btu), indicating an 86% increase. As of June 2006 the shares by energy source are: coal, 49.3%; natural gas, 17.8%; nuclear, 30%; petroleum, 1.5%; hydroelectric, 8.3%; others, 3.1%. The current worldwide energy consumption is 400 quads. By 2050, world consumption will reach 1000 quads, with that of the U.S. about 260 quads (a 300% increase). The energy consumption was 215 mmBtu in 1949 but 337 mmBtu per person in 2005.
