Which energy sources are essentially inexhaustible?

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Renewable natural resources are energy sources that are essentially inexhaustible because they are replenished by natural processes on human timescales. The sun provides a continuous input of energy, wind arises from solar-driven atmospheric patterns, water cycles sustain hydropower and tidal energy, and Earth’s internal heat offers geothermal energy. Because these sources are renewed as we use them, they don’t run out in any practical sense, making them reliable for long-term energy supply. Of course, their availability can fluctuate with weather, location, and scale, so sustainable management is still important to keep them abundant. In contrast, nonrenewable natural resources are finite, natural resources is a broad category that includes both renewable and nonrenewable, and ecosystem services are benefits provided by ecosystems rather than direct energy sources.