A Second Iron Age Ahead

摘要: The distribution of chemical elements in the Earth's crust sets natural limits to man's supply. annual per capita consumption newly mined mineral products for all peoples world now totals 3.75 metric tons and includes coal, oil, iron, copper, cement, etc. total is still rising doubling every decade. A failure supply one metal results application another metal. author contends that more important than energy shortages. Without metals, little available could be used. paper explores way metals occur, an attempt made place perspective limitations this may ultimately impose. decline availability will part controlled by international politics. production scarce lies unexploited areas, mainly less-inhabited areas Asia such as Siberia, central northern portions Africa, much South America, Australia Antarctica, ocean floor. believes less a century second iron age dawn. (MCW)