Why are solar photovoltaic, wind, and geothermal considered renewable energy resources?

Solar, wind, and geothermal energy come from natural processes that are continually renewed: sunlight keeps arriving, winds are driven by ongoing atmospheric processes, and Earth’s internal heat is continually available. This makes them renewable resources. They are not renewable merely because their facilities use recycled materials or because they produce fewer greenhouse gases; resources that are only depleted slowly are not necessarily renewable.

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