A resource that naturally replenishes on a human timescale is often termed sustainable. This characteristic allows for its continuous use without depletion. Examples include solar power derived from the sun, wind energy... Read more »
Energy derived from natural sources that are replenished at a higher rate than they are consumed is categorized as renewable. Solar, wind, hydro, geothermal, and biomass energy are prime examples. These sources... Read more »
Substances extracted from the Earth that form naturally but at a rate far slower than human consumption are considered finite. Fossil fuels, such as coal, oil, and natural gas, exemplify this category.... Read more »