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Use of energy and raw materials
Industrial growth is widely seen as inevitably accompanied by corresponding increases in energy and raw material consumption. In the past two decades, however, this pattern appears to have fundamentally changed. As growth has continued in the developed market economies, the demand for many basic materials, including energy and water, has levelled off; in some cases, it has actually declined in absolute terms.
Energy consumption per unit of GDP in OECD countries has been dropping at a rate of 1-3 per cent every year since the late 1960s. Between 1973 and 1983, these nations improved energy efficiency by 1.7 per cent annually. Industrial water consumption per unit of production has also declined. Older pulp and paper mills typically used about 160 cubic metres of water per ton of pulp; those built during the 1970s, however, used only 70. With advanced techniques that keep water circulating within a closed system, and with proper staff training, use rates could be lowered to 20-30 cubic metres per ton of pulp.
An integrated steel mill uses about 80-200 tons of water for every ton of crude steel. However, since only about 3 tons of water per ton of crude steel are lost, mostly by evaporation, recycling can greatly reduce consumption. Closed water circulation systems are not unique to the steel industry or to developed market economies. Between 1975 and 1980, the chemical industry's output in the USSR increased by 76 per cent, but the total consumption of fresh water remained at the 1975 level. And between 1981 and 1986, Soviet industrial output increased by 25 per cent but industrial water consumption remained constant
