In previous papers we have considered the optimal mix of biodiversity in semi-arid rangelands, focusing on the steady state. This paper addresses the question of conservation in the optimal use of rangelands. That is, it considers the optimal trajectory of biodiversity change. There are two...

This paper considers the overgrazing problem in low income countries, paying special attention to the joint influence of the economic and natural "environments" within which livestock farmers operate. The context is the argument that liberalisation of agricultural product markets will encourage...

The Brundtland Report (WCED, 1987) encouraged the view that the main threats to the environmental sustainability of development are poverty-driven depletion of environmental resources in the developing world, and consumption-driven pollution of the biosphere by the developed world. Recent work...

One of the most important services provided by forests is the control of erosion. We investigated the value of forest cover in protecting water quality in five urban lakes around Prescott, AZ. We first estimated the role of forest cover in regulating sediment loadings into each lake via a...