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Firstly, metal resources are non-renewable, but on a world scale, largely inexhaustible.
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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. Enable a dating on your computer. This is why Ricardo's simplistic notion that the price of a mineral resource should increase over time has in fact turned out to be the opposite, nearly all metal ores have decreased in inflation adjusted prices since well before the early 20th century.
Uranium, the most common fission fuel, and is present in the ground at relatively low concentrations and mined in 19 countries.
Rigorous arguments first appeared in Greek mathematics, most notably in Euclid's Elements. Inthe World Commission on Environment and Development WCED an organization set up by but independent from the United Nations classified fission reactors that produce more fissile nuclear fuel than they consume -i.
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