Major Sectors of Primary Energy

The major sectors using primary energy sources include electrical power, transportation, heating, industrial, and others, such as cooking. The IEA data shows that the electricity demand almost tripled from 1971 to 2002. This is not unexpected because electricity is a very convenient form of energy to transport and use. Although primary energy use in all sectors has increased, their relative shares except for transportation and electricity have decreased (Figure 1.2). Figure 1.2 shows that the relative share of primary energy for electricity production in the world increased from about 20% in 1971 to about 30% in 2002. This is because electricity is becoming the preferred form of energy for all applications.

Figure 1.3 shows that coal is presently the largest source of electricity in the world. Consequently, the power sector accounted for 40% of all CO2 emissions in 2002. Emissions could be reduced by increased

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