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To understand modern society's relationship to energy, it is helpful to think of energy as money, with corresponding categories of income, savings, and expenditures.
The world's annual energy income is all the energy captured each year from new sources. Trees and other plants collect energy income from the sun, as do renewable-energy technologies like hydro, solar, and wind, either directly or indirectly. <중략>
The world's energy savings consist of all the energy that is stored, in whatever form, in various reservoirs. These reservoirs include standing forests, the thermal energy in large bodies of water, and the earth's vast inner heat, uranium, and other fissionable metals. <중략>
Energy expenditure in this context is simply the sum of all energy used within the global economy. The world's rate of energy expenditure is a function of global population and the average energy used by each person, and under nearly all scenarios it is expected to increase. <중략>
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