What is the difference between renewable and non-renewable energy sources?

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Renewable energy sources replenish naturally on human timescales, so their supplies can be used repeatedly without running out, as with solar, wind, and hydro power. Non-renewable energy sources are finite because they form over geological time and are consumed much faster than they can form, like coal, oil, and natural gas. This captures the essential difference: renewables are replenished by natural processes, while non-renewables are limited and deplete with use. The other statements aren’t accurate: renewables aren’t guaranteed to be cheaper in all cases—cost depends on technology, location, and subsidies; renewables aren’t artificial since they occur in nature and are harnessed; and not all energy sources become renewable over time—fossil fuels remain finite despite time passing.