Life on Earth depends on healthy soils. The soil under our feet is a living system – home to many fascinating plants and animals, whose invisible interactions ensure our well-being and that of the planet. Soils provide us with nutritious food and other products as well as with clean water and flourishing habitats for biodiversity. At the same time, soils can help slow the onset of climate change and make us more resilient to extreme climate events such as droughts and floods. Soils preserve our cultural heritage and are a key part of the landscapes that we all cherish.

It is estimated that 20% of global land is either degraded or undergoing degradation, leading to an annual loss of 12 million hectares of productive land (UNCCD 2017). In Africa, some 715 million ha are degraded, including 65% of all arable land, 30% of all grazing land and 20% of all forests. This is due to increasing populations, poor land management, institutional challenges and climate change (Gnacadja and Wiese 2016).

Established in 1994, the United Nations Convention to Combat Desertification (UNCCD) is the sole legally binding international agreement linking environment and development to sustainable land management. The Convention addresses specifically the arid, semi-arid and dry sub-humid areas, known as the drylands, where some of the most vulnerable ecosystems and peoples can be found.

يتناول هذا الدليل التقني، الذي اشتركت في إعداده أمانتا منظمة الأمم المتحدة للأغذية والزراعة (الفاو) واتفاقية الأمم المتحدة لمكافحة التصحر، بمساهمات من أصحاب المصلحة المتعددين، إدماج المبادئ التوجيهية الطوعية بشأن الإدارة المسؤولة لحيازة الأراضي ومصائد الأسماك والغابات في سياق الأمن الغذائي الوطني في تنفيذ اتفاقية الأمم المتحدة لمكافحة التصحر وتحييد أثر تدهور الأراضي. وبالتالي فتح فصل جديد في الجهود الجارية لمكافحة التصحر وتدهور الأراضي والجفاف.

Successive surveys related to land degradation in India, reveal that despite several announcements and policy changes, the desertification and degradation of land and forest continues to rise. It has posed serious threats to environment, biodiversity, local economy and food security. Globally and nationally, India has been very vocal to address this issue.

In September 2015, the global community agreed on “The 2030 Agenda for Sustainable Development”, including 17 Sustainable Development Goals (SDG) and 169 targets. Goal 15 urges countries to “protect, restore and promote sustainable use of terrestrial ecosystems, sustainably manage forests, combat desertification, and halt and reverse land degradation and halt biodiversity loss”.

From its origins, the concept of desertification has been controversial. The prevailing confusion between two desertification visions, one that considers it as the expansion of deserts and another that emphasizes its anthropogenic component, has been transferred to society.

Desertification is defined as land degradation occurring in the global drylands. It is one of the global problems targeted under the Sustainable Development Goals (SDG 15). The aim of this article is to review the history of desertification and to evaluate the scientific evidence for desertification spread and severity. First quantitative estimates of the global extent and severity of desertification were dramatic and resulted in the establishment of the UN Convention to Combat Desertification (UNCCD) in 1994. UNCCD’s task is to mitigate the negative impacts of desertification in drylands.

The process of desertification is complex, involving interaction between many factors, both environmental and anthropogenic. However, human activities, especially from land-use change and inappropriate land use, are the most influential factors associated with the desertification risk. This study was conducted in Huay Sai, a degraded land in Thailand. The Environmentally Sensitive Area Index (ESAI) model incorporating Geogracphic Information System (GIS) was applied to investigate and map the desertification sensitivity area.

La désertification est une dégradation progressive des sols dans les zones sèches, affectant leur potentiel de productivité biologique et économique. Aujourd’hui, plus de 3,2 milliards de personnes dans le monde vivent sur environ 2 milliards d’hectares de terres dégradées. Par ailleurs, 500 millions de personnes habitent dans des zones déjà touchées par la désertification. Ce phénomène, s’amplifiant et touchant aujourd’hui tous les continents, représente un réel danger pour la santé humaine, la biodiversité, le climat, la sécurité alimentaire, la stabilité et la sécurité.

The United Nations Convention to Combat Desertification defines ‘land degradation’ as a reduction or loss of the biological and economic productivity resulting from land-use mismanagement, or a combination of processes, such as soil erosion, deterioration of soil properties, and loss of natural vegetation and biodiversity. Land degradation is hence an interactive process involving multiple factors, among which climate, land-use, economic dynamics and socio-demographic forces play a key role.

The latest IPCC report highlights that a change in diets for richer nations, and smarter land use, could ensure food security and mitigation of potential climate impacts.

Land surface processes — agriculture, forestry and other land use — account for 28% of anthropogenic emissions. However, natural land processes absorb about a third of the emissions from fossil fuel burning and energy production.