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Peak copper
Peak copper is a hypothetical point in time at which the maximum global copper production rate is reached. Since copper is a finite resource, at some point in the future new production from within the earth will diminish, and at some earlier time production will reach a maximum. When this will occur is a matter of dispute. Unlike fossil fuels, however, copper is scrapped and reused and it has been estimated that at least 80% of all copper ever mined is still available (having been repeatedly recycled).〔(Copper Alliance | Our mission is to defend and grow markets for copper based on its superior technical performance and its contribution to a higher quality of life worldwide ). Copperinfo.com. Retrieved on 14 March 2014.〕 Copper is among the most important industrial metals, valued for its heat and electrical conductivities and malleability. Copper is used in electrical power cables, data cables, electrical equipment, automobile radiators, cooling and refrigeration tubing, heat exchangers, artillery shell casings, small arms ammunition, water pipes, and jewellery.
Copper has been in use at least 10,000 years, but more than 97% of all copper ever mined and smelted has been extracted since 1900. The increased demand for copper due to the growing Indian and Chinese economies since 2006 has led to increased prices and an increase in copper theft.
==History==
Concern about the copper supply is not new. In 1924, noted geologist and copper-mining expert Ira Joralemon warned:
:"... the age of electricity and of copper will be short. At the intense rate of production that must come, the copper supply of the world will last hardly a score of years. ... Our civilization based on electrical power will dwindle and die."
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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