摘要: With the rise in public concern over depletion of natural resources, social role materials industry has come up for closer scrutiny. World models such as those being developed by Professor Forrester and his colleagues at M.I.T. leave little room doubt that economic growth cannot continue far into twenty-first century without enormous advances economical use recycling nonrenewable resources. Although studies specific resource availability carried out Resources Future indicate no crisis before year 2000, this optimistic picture is predicated on large continuing technology ranging all way from geophysical exploratioh through more design. There a serious question to whether incentives private will be sufficient . call forth necessary rate direction technological innovation field insure husbanding world’s Wider governmental, eventually multinational intervention allocation scarce resources may become supplement signals marketplace which not act sufficiently advance. On other hand, there growing realization underdeveloped world they control needs feed its industrial machine can increasingly set their own prices. This wholly bad it tend stimulate development substitute materials. Furthermore long run provide acceptable transferring needed foreign exchange less-developed countries. The face squarely future long-range challenge provided utilization material consumption simply grow anything like rates recent past we have accustomed.