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991.
Abstract . It is the purpose of this paper to examine critically the choice of “zero discharge” as me ultimate goal of our federal water pollution policy and to demonstrate that a goal of 90 percent removal of pollutants from effluents of urban areas will be more economically efficient. Our results indicate that in reaching “Zero discharge,” there is a minimal return in water quality for urban areas which are located on large bodies of water. The final conclusion is that the substantial resources, which would be required to surpass the level of 90 percent removal of pollutants, could be employed more effectively in other social programs.  相似文献   
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It is suggested that Home Economics is a socio-practical field, and an account of this new concept together with a consideration of the relation of theory and practice in a socio-practical field are given. The implications of this for Home Economics are discussed and an outline of what a home economics theory would look like, given that Home Economics is a socio-practical field, is put forward.  相似文献   
994.
There are two types of micro-states, islands and mainland ones. Except for a few islands very close to the coast, most of the insular micro-states are demographically very different from the rest of the Third World. Their death-rates are lower, their birth-rates lower, and the propensity of their populations to migrate to developed countries higher. It is argued here that these differences are based on other social and economic differences, which can be summarized by saying that such states are more Westernized. They were part of the European maritime system at a time when the West did not have the economic strength to penetrate continental areas to the same extent. On the whole they retained colonial links longer.  相似文献   
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To relate family situations to the population problem, viewing family decisions as one of the ultimate determinants of how many people there are on the globe and how rapidly the total population will increase, is proposed as a way of viewing the population problem of the world. Population problems of the developed countries with a growth rate of 1% or less per annum are different from those of the countries with a high growth rate and which have about 45-50% of the population below age 15. This group of young people, plus older people who no longer contribute to productive activity, form the dependency burden on a country. Some sociological and economic variables that affect family size decisions are discussed, and the importance of really understanding these variables in order to formulate better population policies is stressed.  相似文献   
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