Today, environmental crisis and loss of natural resources are the principle causes of the creation of environmental management systems. The optimal management of natural resources requires the assessment and classification of ecological and environmental potentials. Using this method, the abilities and restrictions of resources can be recognized, and their future trends can be predicted. Nebka ...

This paper develops a one-sector endogenous growth model in which renewable natural resources are postulated as both a factor of production and as a measure of environmental quality. We show that sustained economic growth and a non-deteriorating environment can coexist along the economy’s balanced growth path. Moreover, the output growth rate is positively related to the steady-state level of n...

Population-environment studies have implicitly permeated demography but only until the mid-20 century has the debate been rekindled and research expanded. This article reviews the origins and history of the population-environment debate and attempts to provide insight into the most recent approaches and methodology. Beginning with the most traditional relationships established between demograph...

There is a need to select high quality forage legumes that are acid soil-tolerant, drought resistant, and persistent under the close defoliation associated with intensive pasture systems in the humid tropics. A greenhouse pot study was conducted to determine forage legume seedling growth (10 week-old) and regrowth (5 weeks after clipping to an 8-cm residual stubble) responses of ‘Amarillo’ pere...

The problems of organization natural resources management on a global scale are revealed in the article. It is established that billion years atmosphere our planet will undergo drastic changes and lose all its oxygen, rejecting life to oldest anaerobic forms. modelling has shown drop oxygen content can be extremely sharp, level millions times less than current. causes fires other disasters plan...

Objectives: The aim of this research was to study information seeking behavior and the pattern of reading behavior of faculty members of University of Social Welfare & Rehabilitation Sciences in using printed and electronic resources. Methods: The descriptive research method was a survey method. The research was implemented by using an organized questionnaire which was distributed among the ...

Basin territorial structures are defined as unified natural and anthropogenic systems, since the movement of matter, energy information occurs naturally from divide to valley line river within them. Considering global issues soil degradation in watersheds depletion water resources, some regional experience design implementation protection cultivated lands part concept basin nature management pr...

Dr. Abbasali Sanadgol is an associate professor in rangelands and forests research institute, IRAN, He is retired now. He earned his undergraduate and master degrees in natural resources and range management in 1976 and 1992 respectively from natural resources faculty of Tehran University and worked as a natural resources and range management researcher for 29 years at education and research ag...

Science, a weekly journal, is published each Friday by the American Association for the Advancement of Science at The Business Press, Incorporated, N. Queen St. and McGovern Ave., Lancaster, Pa. Founded in 1880. it has been since 1900 the official publication of the AAAS. Editorial and Advertising Offices, 1515 Massachusetts Avenue, N.W.. Washington 5, D. C. Telephone, EXecutive 60 or 6061. Cab...