En esta tesis se investiga la presencia de valores que hace el oso de anteojos (Tremarctus ornatus F. Culvier 1825) y al maíz (Zea maíz L.) inconmensurables, razones por las cuales no se podría instaurar un sistema de compensación monetaria en pago por aceptar las pérdidas de maíz a cambio de que no se mate al animal. El área de investigación comprende parte de la zona de amortiguamiento de la Reserva Ecológica Antisana, específicamente entre los pueblos Baeza y Cosanga que se encuentran al este del Volcán Antisana, entrada al Oriente ecuatoriano.

The countries of circum-Sahara Africa adversely affected by desertification, their sub-regional organisations, their Northern partners and the concerned international organisations of the United Nations System have created the Sahara and Sahel Observatory (OSS) in May 1992. OSS's mission is conducted within the international framework of the Convention to Combat Desertification (CCD) and Agenda 21 and aims to favour the development and the optimisation of its African partners' information wealth, for an optimal use of the means for combating desertification.

This policy provides the framework for addressing problems and constraints to ensure equity in land allocation and holding and to maintain a stable environment for the country's sustainable social and economic development.

Based on a survey of 48 communities in central Honduras, this paper identifies the major pathways of development that have been occurring in central Honduras since the mid-1970s, their causes and implications for agricultural productivity, natural resource sustainability, and poverty.

This paper focuses on the environment and water resources in Africa. Africa is at a threshold of changes and faces challenges that will have a fundamental impact on the survival and prosperity of its people. These challenges are already manifesting themselves in many ways; the most significant of winch is the ability of

African states to ensure food security for a growing population on a sustained basis.

Despite the all-out efforts currently being made by the Myanmar Government to conserve and improve its forest resources, forest degradation and depletion are continuing at an alarming rate, mainly due to shifting cultivation, agricultural encroachment and illicit cutting. The heavy reliance on woodfuel has eroded its supply source in numerous areas and it is clear that unless urgent remedial measures are undertaken the more accessible forests will soon be exhausted and remote areas will have to be exploited instead, involving rising market prices.

La présente stratégie s’inscrit dans le cadre de la Convention Internationale sur la Diversité Biologique. Les objectifs de la stratégie sont de deux ordres, l’un de développement dont l’essence est la recherche de la sécurité alimentaire, et l’autre spécifique pour pallier cette recherche de la productivité avec la gestion rationnelle des ressources.

Conversion of arable land (maize) to pasture will affect the soil organic matter (SOM) content. Changes in the SOM content were studied using a size- and density-fractionation method and C-13 analysis. Twenty-six years of maize cropping had resulted in a depletion of carbon stored in the macro-organic fractions (>150 mu m) and an increase in the 250 mu m), light (b.d. 150 mu m) and light (b.d. 150 mu m; b.d. >1.13 g cm(-3)) in the 0- to 20-cm layer was still 40-50% lower than in the continuous pasture plots.

El presente Decreto declara Zona Intangible de Conservación, vedada a todo tipo de actividad extractiva, las tierra de habitación y desarrollo de los grupos Huaorani, conocidos como Tagaeri Taromenane, y otros eventuales que permanecen sin contacto, ubicadas hacia el sur de las tierras adjudicadas a la nacionalidad Huaorani y del Parque Nacional Yasuní (PNY).

This review explores environmental change in northern and south-central Kenya, roughly covering three decades from the 1960s to the 1990s. The report answers three questions:has vegetation change occurred in these districts?if vegetation change has occurred, why and how has this happened?what are the trends for livestock populations?The article concludes that:rangeland sites have been fundamentally altered by woody encroachment over the past 40 years.