The spread of infectious disease among and between wild domesticated animals has become a major problem worldwide. Upon analyzing the dynamics of wildlife growth and infection when the disease animals cannot be identified separately from healthy wildlife prior to the kill, we find that...

Infected wildlife cannot be selectively harvested for most diseases, complicating disease control. Targeting harvests by sex improves efficiency because disease transmission and prevalence usually vary by sex. We present a bioeconomic model of optimal deer and disease management that...

Bovine tuberculosis (bTB) in cattle has caused significant economic losses to livestock producers and has proven difficult to eradicate. It is suspected that cattle movement across different farms and regions is one of the key factors of bTB transmission in the United States. Prior attempts to...

Most of the increase in ethanol production in the 2008-2012 period can be attributed to the Energy Independence and Security Act of 2007 (EISA) and earlier federal energy legislation. The expansion in U.S. biofuel production, particularly ethanol, was the predominant cause of the elevated...

Forests support rural livelihoods and food security in many developing countries by providing critical sources of food, medicine, shelter, building materials, fuels, and cash income. The increasing demand for forest products has enhanced rural livelihoods and enabled the expansion of domestic...

Smallholder farmers in many areas of the semiarid tropics are planting exotic tree species that provide alternative income sources, fuel, and building materials. While providing other benefits, these trees often occupy land that could produce annual food crops. This study uses a polyperiod,...

Agricultural expansion has traditionally led colonization of the Amazonian rainforest. Recently, pioneer farmers in the forest margins around Pucallpa, Peru, have been changing their production decisions and altering the deforestation process. In response to a government policy to protect...

That residents of Zimbabwe's Communal Areas (CAs) obtain a variety of goods and services from their natural woodlands has long been recognized. Little was known however, of the value or preferences of CA residents for these goods and services. This paper describes a study, carried out in...

This paper outlines a framework that will facilitate the assessment of the financial sustainability of proposed improvements in water and sanitation facilities. Financially sustainable services are those in which the revenues generated from the service users exceed the cost of providing the...