Ce livre constitue un ensemble d’informations de base sur la désertification, la dégradation des terres et la sécheresse à l’échelle mondiale, accompagnées d’une série de graphiques. Celui-ci présente les évolutions ayant eu lieu au cours des dernières décennies, en associant les questions et les priorités actuelles.

Este libro tiene como objetivo ser un manual informativo en el que se cuenta “la historia” de la desertificación, la degradación de las tierras y la sequía a escala global acompañado por una completa serie de gráficos. Este libro muestra tendencias que han tenido lugar a lo largo de las últimas décadas, combinando y conectando temas y presentando prioridades.

This book is intended as a basic information kit that tells “the story” of desertification, land degradation and drought at the global scale, together with a comprehensive set of graphics. The book indicates trends as they have taken place over the last decades, combining and connecting issues, and present priorities.

This book is intended as a basic information kit that tells “the story” of desertification, land degradation and drought at the global scale, together with a comprehensive set of graphics. The book indicates trends as they have taken place over the last decades, combining and connecting issues, and present priorities.

This book is intended as a basic information kit that tells “the story” of desertification, land degradation and drought at the global scale, together with a comprehensive set of graphics. The book indicates trends as they have taken place over the last decades, combining and connecting issues, and present priorities.

We can no longer turn a blind eye to urgent sustainable development challenges such as climate change, the food crisis, disappearing biodiversity and the depletion of natural resources. A way to rise to these challenges is through Education for Sustainable Development (ESD). ESD is a dynamic concept that aims to enable people of all ages and from all walks of life to pursue and benefit from a sustainable future.

The earth’s climate is changing at a rate unprecedented in recent human history and will continue to do so for the foreseeable future. The impacts and risks associated with this are global, geographically diverse and increasingly being felt across a range of systems and sectors essential for human livelihoods and well-being. The more severe and far-reaching the impacts of climate change are, the greater the loss of species will be, and the greater the deterioration of drylands and the risk of desertification and land degradation around the world will be.

The challenges and threats of water scarcity to dryland populations are set to increase in magnitude and scope. As the world’s population has swollen to well over 6 billion people, some countries have already reached the limits of their water resources. With the existing climate change scenario, almost half the world’s population will be living in areas of high water stress by 2030, including between 75 million and 250 million people in Africa. In addition, water scarcity in some arid and semi-arid places will displace between 24 million and 700 million people (WWDR 2009).

Los desafíos y retos que supone la escasez de agua para las poblaciones de las tierras secas se van a ver incrementados tanto en magnitud como en alcance. Dado que la población mundial es ya superior a los 6.000 millones de personas, algunos países han superado los límites de sus recursos acuíferos. Con el escenario actual de cambio climático, casi la mitad de la población mundial habitará áreas con grandes problemas de agua antes del 2030, lo que incluye a una población de entre 75 y 250 millones de personas en África.

The Africa–Asia Drought Risk Management Peer Assistance Project seeks to facilitate the sharing of knowledge and technical cooperation among drought-prone countries in Africa and Asia and thus to promote best practices in drought risk management (DRM) for development in the two regions. In order to establish a baseline to guide this activity, the United Nations Development Programme Drylands Development Centre (UNDP DDC) undertook a stocktaking exercise between March and June 2011 on drought impacts, causes, trends and solutions in Africa and Asia.

Les terres3 peutvent se définir comme un système destiné à générer de la productivité biologique. C’est l’infrastructure naturelle qui supporte la vie sur la planète. La quantité et la qualité de cette production dépendent du principal composant de la terre : le sol et sa fertilité. La matière organique du sol, qui provient de la végétation portée par ce dernier, est le principal composant influençant la fertilité du sol.

La tierra se define como un sistema bioproductivo. Es la infraestructura terrestre para la vida. La tasa y la calidad de la producción generada por la tierra dependen de sus principales componentes, de los suelos y de su fertilidad. La materia orgánica del suelo, derivada de la vegetación que crece en un suelo determinado, es el principal componente que controla la fertilidad de éste.