A non-renewable resource (also called a finite resource) is a natural resource that cannot be readily replaced by natural means at a pace quick enough to keep up with consumption. An example is carbon-based fossil fuels. The original organic matter, with the aid of heat and pressure, becomes a fuel such as oil or gas. Earth minerals and metal ores, fossil fuels (coal, petroleum, natural gas) and groundwater in certain aquifers are all considered non-renewable resources, though individual elements are always conserved (except in nuclear reactions, nuclear decay or atmospheric escape). Conversely, resources such as timber (when harvested sustainably) and wind (used to power energy conversion systems) are considered renewable resources, largely because their localized replenishment can also occur within our lifespans.
Earth minerals and metal ores
Earth minerals and metal ores are examples of non-renewable resources. The metals themselves are present in vast amounts in Earth's crust, and their extraction by humans only occurs where they are concentrated by natural geological processes (such as heat, pressure, organic activity, weathering and other processes) enough to become economically viable to extract. These processes generally take from tens of thousands to millions of years, through plate tectonics, tectonic subsidence and crustal recycling. The localized deposits of metal ores near the surface which can be extracted economically by humans are non-renewable in human time-frames. There are certain rare earth minerals and elements that are more scarce and exhaustible than others. These are in high demand in manufacturing, particularly for the electronics industry.
Fossil fuels
Natural resources such as coal, petroleum (crude oil) and natural gas take thousands of years to form naturally and cannot be replaced as fast as they are being consumed. It is projected that fossil-based resources will eventually become too costly to harvest and humanity will need to shift its reliance to renewable energy such as solar or wind power. An alternative hypothesis is that carbon-based fuel is virtually inexhaustible in human terms, if one includes all sources of carbon-based energy such as methane hydrates on the sea floor, which are much greater than all other carbon-based fossil fuel resources combined. These sources of carbon are also considered non-renewable, although their rate of formation/replenishment on the sea floor is not known. However, their extraction at economically viable costs and rates has yet to be determined. At present, the main energy source used by humans is non-renewable fossil fuels. Since the dawn of internal combustion engine technologies in the 19th century, petroleum and other fossil fuels have remained in continual demand. As a result, conventional infrastructure and transport systems, which are fitted to combustion engines, remain predominant around the globe. The modern-day fossil fuel economy is widely criticized for its lack of renewability, as well as being a contributor to climate change.
Nuclear fuels
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![Non-renewable resource: Rössing uranium mine is the longest-running and one of the largest open pit uranium mines in the world; in 2005 it produced eight percent of global uranium oxide needs (3,711 tons).[4] The most productive mines are the underground McArthur River uranium mine in Canada, which produces 13% of the world's uranium, and the underground poly-metallic Olympic Dam mine in Australia, which is mainly a copper mine, but contains the largest known reserve of uranium ore.](https://upload.wikimedia.org/wikipedia/commons/thumb/5/51/Arandis_Mine_quer.jpg/1280px-Arandis_Mine_quer.jpg?utm_source=en.wikipedia.org&utm_campaign=parser&utm_content=thumbnail)
![Non-renewable resource: Annual release of "technologically enhanced"/concentrated naturally occurring radioactive material, uranium and thorium radioisotopes naturally found in coal and concentrated in heavy/bottom coal ash and airborne fly ash.[5] As predicted by ORNL to cumulatively amount to 2.9 million tons over the 1937–2040 period, from the combustion of an estimated 637 billion tons of coal worldwide.[6] This 2.9 million tons of actinide fuel, a resource derived from coal ash, would be classified as low grade uranium ore if it occurred naturally.](https://upload.wikimedia.org/wikipedia/commons/0/02/Uranium_and_thorium_release_from_coal_combustion.gif?utm_source=en.wikipedia.org&utm_campaign=parser&utm_content=thumbnail_unscaled)

