*Correspondence: Qinfeng Guo, Eastern Forest Environmental Threat Assessment Center, United States Department of Agriculture (USDA) Forest Service, 200 WT Weaver Blvd., Asheville, NC 28804, USA e-mail: [email protected] The species’ range limits and associated central-marginal (C-M, i.e., from species range center to margin) population dynamics continue to draw increasing attention because of thei...

models of living in cities needs planning for land use. those who have planned for the cities have studied land use to present a model for the construction of cities. change of land use, is the main concern today. the factors which affect the change in land use can be divided into three main groups: legal factors, economical factors and population. out of these three factors, population has bee...

It is now well established that world-wide demographic shifts are going to affect both the U.S. and world economies in ways that are not entirely predictable. What we can do—and what Ronald Lee and Ryan Edwards do so well—is to plot out for the future some of the fiscal implications under reasonable guesses about demographic, economic, and legal factors. These factors include what we know alrea...

Behavioral science provides useful ideas about how programs of mass communication and community participation can produce synergistic influences on the lifestyles and policy decisions of populations and their representatives. Media campaigns featuring real-life behavior models and community networks mobilized to promote behavior change provide a theoretically sound paradigm for community-level ...

The movement of labor out of agriculture is a universal concomitant of economic modernization and growth. Traditional migration models overlook many potential interactions between migration and development. Given imperfect markets characterizing most migrantsending areas, migration and remittances can have far-reaching impacts, both positive and negative, on incomes and production in agricultur...