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alternative energy-energy derived from sources that do not use up natural resources or harm the environment. energy, free energy - (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs; energy can take a wide variety of forms.
1 The expression âproduce energyâ typically refers to the conversion of stored energy into a desired form for practical use. (4-PS3-4)  Energy and fuels that humans use are derived from natural sources, and their use affects the environment in multiple ways. Some resources are renewable over time, and others are not.