Fuel encompasses materials reacting with other substances to release energy, either as thermal energy or for work. Initially, the term applied only to materials releasing chemical energy. However, its definition has broadened to include other heat energy sources, like nuclear energy. Thus, the scope of 'fuel' extends beyond traditional chemical combustion to encompass any substance or process capable of generating usable energy.
In 2005, coal combustion was responsible for generating 40% of the world's electrical power.
In 2006, non-fossil energy sources included hydroelectric (6.3%), nuclear (8.5%), and other sources such as geothermal, solar, tidal, wind, wood, and waste (0.9%).
In 2007, the Energy Information Administration estimated that primary sources of energy consisted of petroleum (36.0%), coal (27.4%), and natural gas (23.0%), making up 86.4% of fossil fuels in primary energy consumption worldwide.
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