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Desertification represents one of the most pressing environmental challenges facing our planet today, transforming productive land into barren, degraded landscapes that can no longer support the communities and ecosystems that depend on them. An area the size of Egypt, around 100 million hectares, of healthy and productive land is being degraded each year due to drought and desertification, which is being driven mainly by climate change and poor land management. This phenomenon affects billions of people worldwide and threatens food security, water availability, and economic stability across multiple continents.
Desertification refers to land degradation in arid, semi-arid and dry sub-humid areas resulting from various factors, including climatic variations and human activities. It is crucial to understand that desertification does not simply mean the physical expansion of existing deserts outward. Rather, it involves the degradation of dryland ecosystems to the point where they lose their biological productivity and can no longer sustain the plant and animal life they once supported.
The Global Scale of Desertification
The scope of desertification is staggering and continues to expand at an alarming rate. Drylands occupy approximately 40–41% of Earth’s land area and are home to more than 2 billion people. These vulnerable regions span across every inhabited continent, with particularly severe impacts in specific geographic zones.
United Nations’ latest data, as presented by 126 Parties in their 2022 national reports, show that 15.5% of land is now degraded, an increase of 4% in as many years. This rapid acceleration demonstrates that desertification is not a static problem but one that is intensifying as climate change and human pressures continue to mount.
Most Affected Regions
Geographic areas most affected are located in Africa (Sahel region), Asia (Gobi Desert and Mongolia) and parts of South America. The African continent faces particularly severe challenges, with 46 of the 54 countries in Africa vulnerable to desertification, with some already affected.
Currently, around 2 billion people live in drylands, which are most prone to desertification. Among the most affected regions are Africa and Eastern and Central Asia. The human toll is immense, with desertification hotspots, as identified by a decline in vegetation productivity between the 1980s and 2000s, extended to about 9.2% of drylands, affecting about 500 million people in 2015.
More than 75 percent of Earth’s land area is already degraded, according to the European Commission’s World Atlas of Desertification, and more than 90 percent could become degraded by 2050. This projection underscores the urgency of addressing desertification through coordinated global action.
Understanding the Causes of Desertification
Desertification results from a complex interplay of natural and human-induced factors. While climate variability has always influenced dryland ecosystems, human activities have dramatically accelerated the degradation process in recent decades.
Climate Change as a Primary Driver
Climate change has emerged as one of the most powerful forces driving desertification worldwide. Climate change is a powerful driver of desertification. As global temperatures rise, land surfaces warm even faster – leading to higher rates of evaporation, reduced soil moisture, and declining vegetation.
Rising temperatures create a cascade of effects that accelerate land degradation. Higher temperatures increase evapotranspiration rates, drawing moisture from soils faster than it can be replenished. This leaves the ground increasingly dry and unable to support vegetation, which in turn exposes soil to erosion and further degradation.
Precipitation was consistently the primary factor influencing desertification, with an average SHAP value of 11.42. Changes in rainfall patterns represent another critical climate-related factor. Many dryland regions are experiencing more prolonged and severe droughts, while when rain does fall, it often comes in intense bursts that cause flash flooding rather than soil absorption.
A 2024 UN report found that in the last three decades, over three-fourths of all the world’s land became drier than it had been in the previous 30 years. Drylands now comprise 40.6% of all global land (excluding Antarctica). In addition, the number of people living in drylands doubled over the last 30 years to 2.3 billion, which represents over 25% of the global population.
Overgrazing and Livestock Management
Overgrazing represents one of the most significant human-induced causes of desertification in dryland regions. When livestock populations exceed the carrying capacity of rangelands, animals consume vegetation faster than it can regenerate, stripping grasslands down to bare soil.
Animals strip grasslands down to bare soil, and in some cases eat plants right down to the roots, preventing any regrowth. This exposes the ground to wind and water erosion, depletes soil nutrients, and reduces the land’s capacity to retain moisture.
In Mongolia, for example, around 90% of grassland is considered vulnerable to desertification. The shift from sheep to goat farming – driven by global demand for cashmere wool – has significantly accelerated rangeland degradation in the country. This example illustrates how global market forces can drive local land degradation practices that contribute to desertification.
Deforestation and Vegetation Loss
The immediate cause of desertification is the loss of most vegetation. This is driven by a number of factors, alone or in combination, such as drought, climatic shifts, tillage for agriculture, overgrazing and deforestation for fuel or construction materials.
Deforestation contributes to desertification because without trees, the soil cannot retain moisture. Already 50% of tropical forests in South America, Africa and Southeast Asia have been cut down for cattle ranching or soy and palm oil plantations. Trees play a crucial role in maintaining soil structure, retaining moisture, and protecting against erosion. When forests are cleared, these protective functions are lost.
Deforestation, which contributes to desertification, is on the rise, with only 60 per cent of the world’s forests still intact, falling below what the UN calls the “safe target of 75 per cent.”
Unsustainable Agricultural Practices
Agricultural methods that fail to account for the fragility of dryland ecosystems contribute significantly to desertification. Intensive farming methods such as monoculture cropping, excessive tillage, and improper irrigation practices deplete soil nutrients and damage soil structure over time.
Irrigation, while essential for agriculture in dry regions, can paradoxically contribute to desertification when poorly managed. Salt buildup from poorly managed irrigation is a major problem – over 60% of irrigated areas globally are in drylands, and about 30% of that irrigated dryland is moderately to severely degraded.
Agricultural approaches such as tilling and the use of chemical fertilizers and pesticides that kill good microbiota and remove important nutrients can leave the land barren. These practices destroy the complex soil ecosystems that are essential for maintaining soil health and fertility in dryland environments.
Water Overextraction
The overextraction of water from aquifers, usually for irrigation, can lead to desertification. A prime example of this is how the over-irrigation of cotton drew too much water from the Aral Sea in Central Asia, once the fourth largest lake in the world, shrinking the lake to one-tenth its size, salinizing the soils, and turning the exposed seabed into the Aralkum Desert.
This dramatic example demonstrates how unsustainable water use can transform entire landscapes. The Aral Sea disaster stands as one of the most visible and devastating cases of human-induced desertification, affecting millions of people and destroying what was once a thriving ecosystem.
Environmental Impacts of Desertification
The environmental consequences of desertification extend far beyond the immediate loss of productive land. These impacts create cascading effects that alter ecosystems, climate patterns, and the fundamental capacity of land to support life.
Soil Degradation and Erosion
Every year, 24 billion tons of fertile soil are lost to erosion. This massive loss of topsoil represents the destruction of a resource that takes centuries to form naturally. The soils on these lands which can take hundreds of years to form are being depleted, often by extreme weather.
Studies have shown that, in many environments, the rate of erosion and runoff decreases exponentially with increased vegetation cover. Unprotected, dry soil surfaces blow away with the wind or are washed away by flash floods, leaving infertile lower soil layers that bake in the sun and become an unproductive hardpan.
Once soil reaches this degraded state, natural recovery becomes extremely difficult. The loss of organic matter, nutrients, and soil structure creates a self-reinforcing cycle where the land becomes progressively less able to support vegetation, which in turn leads to further erosion and degradation.
Loss of Biodiversity
Desertification causes severe biodiversity loss as habitats are degraded and species lose the resources they need to survive. Dryland ecosystems, despite their harsh conditions, support unique assemblages of plants and animals specially adapted to arid environments. When these ecosystems are degraded, many species face local or complete extinction.
The loss of plant diversity has particularly severe consequences. Plants in dryland ecosystems often have specialized adaptations for water conservation and soil stabilization. When these species disappear, the ecosystem loses critical functions that help maintain land productivity and resilience.
Water Scarcity and Hydrological Changes
Droughts are hitting harder and more often, three out of four people in the world are projected to face water scarcity by 2050. Desertification both results from and contributes to water scarcity, creating a vicious cycle that is difficult to break.
In dry regions, many aquifers are being degraded or depleted because too much water is drawn for agriculture, creating water scarcity. As groundwater levels drop and surface water becomes scarce, communities face increasing challenges in meeting basic water needs for drinking, sanitation, and agriculture.
In the mountains, a lack of snow has led to the gradual disappearance of glaciers, threatening water security that affects both people and agriculture. This loss of mountain water sources has downstream effects on millions of people who depend on glacier and snowmelt for their water supply.
Dust Storms and Air Quality
Vegetation loss and drying of surface cover due to desertification increases the frequency of dust storms. These dust storms have impacts that extend far beyond the immediate area of degradation, affecting air quality, human health, and climate patterns across vast regions.
Dust storms can transport fine particles thousands of kilometers from their source, affecting air quality in distant cities and depositing sediment in oceans and other ecosystems. The health impacts include respiratory problems, eye irritation, and the spread of pathogens and allergens carried on dust particles.
Climate Feedback Mechanisms
Desertification exacerbates climate change through several mechanisms such as changes in vegetation cover, sand and dust aerosols and greenhouse gas fluxes. This creates a dangerous feedback loop where climate change drives desertification, which in turn contributes to further climate change.
Desertification can even contribute to climate change, as desertification reduces the soil’s capacity to store carbon. Healthy soils act as significant carbon sinks, storing vast amounts of organic carbon. When land degrades, this stored carbon is released into the atmosphere as carbon dioxide, contributing to global warming.
Drylands store approximately 46% of the global carbon share. Its soils contain 53% of global soil carbon and its plants 14% of the global biotic carbon. The degradation of these carbon-rich ecosystems therefore has significant implications for global climate regulation.
Socio-Economic Consequences of Desertification
The human costs of desertification are profound and multifaceted, affecting the lives and livelihoods of billions of people worldwide. These impacts are felt most acutely by the world’s poorest and most vulnerable populations.
Food Insecurity and Agricultural Decline
Desertification is both a result of and a cause of erosion of fertile soils, reducing agricultural and livestock productivity. If current land degradation trends continue, crop yields could decline 50% by 2050. This projected decline in agricultural productivity poses an existential threat to food security in affected regions.
Global food security is being threatened by desertification. The more that population grows, the more food that has to be grown. Meanwhile, 44% of agricultural land is located in dry lands and it supplies 60% of the world’s food production. Desertification is decreasing the amount of sustainable land for agricultural uses but demands are continuously growing.
A total of 842 million people, or about one in eight people in the world, were estimated to be suffering from chronic hunger in 2011-2013 and 12 million hectares of productive land become barren every year due to desertification and drought alone, which is a lost opportunity to produce 20 million tonnes of grain.
Poverty and Economic Impacts
Poverty is both a cause and a consequence of land degradation. This bidirectional relationship creates a poverty trap where poor communities lack the resources to implement sustainable land management practices, leading to further degradation that deepens poverty.
The livelihoods of more than 1 billion people in some 100 countries are threatened by desertification. Nearly 1 billion of the poorest and most marginalized people, who live in the most vulnerable areas, may be the most severely affected by desertification.
Land degradation is now costing US$490 billion per year and wiping out an area three times the size of Switzerland on an annual basis. These economic losses represent not just financial costs but lost opportunities for development, education, healthcare, and poverty reduction.
The Millennium Assessment found that in general, the human well-being of dryland peoples is lower than that of people in other ecological systems. For example, compared to other ecosystems, infant mortality rates are highest in drylands and gross national product (GNP) per capita lowest.
Migration and Displacement
It is estimated that 135 million people are at risk of being displaced by desertification. The problem is most severe in sub-Saharan Africa, particularly in the Sahel and the Horn of Africa. As land becomes unable to support populations, people are forced to migrate in search of livelihood opportunities elsewhere.
Desertification often causes rural lands to become unable to support the same sized populations that previously lived there. This results in mass migrations out of rural areas and into urban areas particularly in Africa creating unemployment and slums.
Desertification combined with land degradation and drought in rural areas where people rely on limited productive land resources is one of the drivers of forced migration. The effects of desertification are increasingly felt globally as victims turn into refugees, internally displaced people and forced migrants.
This migration creates challenges both for the migrants themselves and for the communities receiving them. Urban areas often lack the infrastructure and economic opportunities to absorb large influxes of environmental refugees, leading to the growth of informal settlements and increased competition for resources.
Social and Political Instability
The resource scarcity created by desertification can fuel social tensions and conflict. Competition for dwindling water, grazing land, and agricultural areas can escalate into violence between communities, particularly where governance structures are weak.
Desertification and land degradation lead to hunger and poverty, drive unemployment, forced migration and conflict, while increasing the risk of extreme weather related to climate change. This interconnection between environmental degradation and social instability creates complex challenges that require integrated solutions addressing both environmental and social dimensions.
Regional Case Studies of Desertification
The Sahel Region of Africa
The impact of climate change and human activities on desertification are exemplified in the Sahel region of Africa. The region is characterized by a dry hot climate, high temperatures and low rainfall (100–600 mm per year). So, droughts are the rule in the Sahel region. The Sahel has lost approximately 650,000 km2 of its productive agricultural land over the past 50 years; the propagation of desertification in this area is considerable.
The Sahel represents one of the world’s most vulnerable regions to desertification, with millions of people dependent on agriculture and pastoralism in an increasingly hostile environment. The combination of climate variability, population pressure, and unsustainable land use has created a severe crisis affecting multiple countries across the region.
Mali and the Expanding Sahara
Mali is located in West Africa, straddling the Sahara so 65% of its area is desert or semi-desert. The Sahara itself is steadily expanding southwards at a rate of 48km per year, forcing many to evacuate and leave their homes behind.
Three-quarters of the population rely on agriculture for their food and income, and as the population grows and arable land dwindles, the situation becomes more untenable. Moreover, lack of food security feeds conflictual thinking, and civil strife has plagued the country for decades. Finally, climate change is accelerating all of the above through increased drought: the UN says Mali’s average rainfall has dropped 30% since 1998.
China and the Gobi Desert
China’s share of desert land has rapidly increased since the 1980s and now stands at 30% of its total area. The creeping deserts threaten farmland, forcing people to abandon their homes, and will lead to food insecurity if they aren’t addressed.
China has responded with massive reforestation and land restoration programs. A similar effort is underway in northern China, with the government planting trees along the border of the Gobi desert to prevent it from expanding as farming, livestock grazing, and urbanization, along with climate change, removed buffering vegetation.
The Aral Sea Disaster
The Aral Sea basin represents one of the most dramatic examples of human-induced desertification. Once the fourth-largest lake in the world, the Aral Sea has shrunk to a fraction of its former size due to water diversion for cotton irrigation.
In the regions of Uzbekistan and Kazakhstan surrounding the Aral Sea, excessive use of water for agricultural irrigation has been a primary culprit in causing the sea to shrink, leaving behind a saline desert. The exposed seabed has become the Aralkum Desert, with salt and dust storms affecting human health and agriculture across a wide area.
Southern Europe’s Growing Vulnerability
Southern Europe has seen some of its worst droughts in recent years. In Spain, desertification and overexploitation have severely affected what’s known as “Europe’s kitchen garden”. The European Union has flagged the vulnerability of its southern members to desertification in recent years, pointing not only to Spain but also Portugal, Italy, Greece, Cyprus, Bulgaria and Romania.
This demonstrates that desertification is not limited to traditionally arid regions but is increasingly affecting areas once considered immune to such degradation.
Combating Desertification: Solutions and Strategies
While the challenges posed by desertification are severe, there is growing recognition that land degradation can be reversed through appropriate interventions and sustainable land management practices.
Sustainable Land Management
Applying sustainable land management practices helps to combat desertification and to recover and rehabilitate land; soil, water and vegetation. These practices encompass a wide range of techniques adapted to local conditions and needs.
Land rehabilitation practices such as mulching, composting, manuring and mixed cropping and reforesting, which increase carbon stocks in the soil, contributing directly to soil carbon sequestration. These techniques are also part of the technology toolbox known as sustainable land management.
Methods of mitigating or reversing desertification include improving soil quality, greening deserts, managing grazing, and tree-planting (reforestation and afforestation). Each of these approaches addresses specific aspects of land degradation and can be combined for maximum effectiveness.
Restoration and Reforestation Initiatives
UNCCD says that to “deliver a moonshot moment for land,” 1.5 billion hectares of degraded lands need to be restored by 2030. This ambitious target reflects the scale of action needed to address global desertification.
The UNCCD has also promoted the Great Green Wall Initiative, an effort to restore 386,000 square miles (100 million hectares) across 20 countries in Africa by 2030. This massive project aims to create a mosaic of green and productive landscapes across the Sahel region.
The Great Green Wall initiative in Africa has evolved away from the idea of simply planting trees and toward the idea of “re-greening,” or supporting small farmers in managing land to maximize water harvesting (via stone barriers that decrease water runoff, for example) and nurture natural regrowth of trees and vegetation.
Water Management and Conservation
Improved water management is essential for combating desertification in dryland regions. This includes techniques such as rainwater harvesting, efficient irrigation systems, and watershed management that maximizes water retention in the landscape.
Traditional water conservation techniques, such as stone barriers and terracing, can significantly reduce runoff and increase soil moisture. Modern drip irrigation and other precision agriculture technologies can dramatically reduce water waste while maintaining or improving crop yields.
Grazing Management
Sustainable grazing practices are crucial in pastoral regions. This includes rotational grazing systems that allow vegetation to recover, maintaining appropriate stocking rates, and protecting sensitive areas from grazing pressure.
Community-based rangeland management, where local herders participate in decision-making about grazing practices, has shown promise in many regions. These approaches combine traditional knowledge with scientific understanding to develop sustainable grazing systems.
Soil Conservation Techniques
Protecting and improving soil health is fundamental to combating desertification. Techniques include conservation tillage or no-till agriculture, cover cropping, crop rotation, and the addition of organic matter to rebuild soil structure and fertility.
Preventing soil erosion through windbreaks, contour plowing, and maintaining vegetation cover helps preserve the topsoil that is essential for agricultural productivity. Once soil is lost to erosion, it can take centuries to rebuild naturally.
Community Engagement and Local Solutions
Crucially, it is the people who depend on land who should have the biggest say in how decisions are made. Successful desertification control requires the active participation of local communities who understand their land and have the greatest stake in its sustainable management.
“The absolute number of farmers in these [at-risk rural] regions is so large that even simple and inexpensive interventions can have regional impacts,” write the authors of the World Atlas of Desertification, noting that more than 80 percent of the world’s farms are managed by individual households, primarily in Africa and Asia. “Smallholders are now seen as part of the solution of land degradation rather than a main problem, which was a prevailing view of the past.”
International Frameworks and Cooperation
The UN Convention to Combat Desertification
The United Nations Convention to Combat Desertification (UNCCD) – the primary international agreement addressing this issue – notes that desertification directly affects around 250 million people and threatens the livelihoods of roughly one billion more across over 100 countries. Established in 1994, the UNCCD remains the only legally binding international framework that links land management to sustainable development.
Three decades ago, in 1994, 196 countries and the European Union signed up to the UN Convention to Combat Desertification or UNCCD. UNCCD is the global voice for land where governments, businesses and civil society come together to discuss challenges and chart a sustainable future for land.
Land Degradation Neutrality
In 1994, the United Nations established the Convention to Combat Desertification (UNCCD), through which 122 countries have committed to Land Degradation Neutrality targets, similar to the way countries in the climate Paris Agreement have agreed to targets for reducing carbon pollution. These efforts involve working with farmers to safeguard arable land, repairing degraded land, and managing water supplies more effectively.
The concept of Land Degradation Neutrality aims to maintain or improve the amount and quality of land resources necessary to support ecosystem functions and services. This approach recognizes that some degradation may be unavoidable but seeks to balance it with restoration efforts elsewhere.
Integration with Climate and Biodiversity Efforts
The UNCCD is one of the three Rio Conventions, along with the UN Framework Convention on Climate Change and the Convention on Biological Diversity – and all three are taking place in 2024. This coordination reflects growing recognition that desertification, climate change, and biodiversity loss are interconnected challenges requiring integrated solutions.
There is clear evidence that land degradation is interconnected with broader environmental challenges like climate change. Addressing desertification therefore contributes to climate mitigation through carbon sequestration and to biodiversity conservation through habitat restoration.
The Path Forward: Hope and Challenges
The good news is that humankind has the knowhow and power to bring land back to life, turning degradation into restoration. Robust economies and resilient communities can be cultivated as the impacts of devastating droughts and destructive floods are tackled.
Success stories from around the world demonstrate that desertification can be reversed. This is happening already with farmers adopting new techniques in Burkina Faso, environmentalists in Uzbekistan planting trees to eliminate salt and dust emissions and activists protecting the Philippines capital, Manila, from extreme conditions.
Between 1983 and 2003, approximately 16% of the land improved, of which 20% is cropland and 43% rangeland. While this represents progress, the scale of improvement still lags far behind the rate of degradation, highlighting the need for dramatically scaled-up efforts.
Scaling Up Solutions
The technical knowledge and practical solutions for combating desertification exist. The primary challenges now are mobilizing sufficient financial resources, building institutional capacity, ensuring political will, and empowering local communities to implement sustainable land management at scale.
Investment in land restoration offers significant returns. Restored land provides ecosystem services including food production, water regulation, carbon sequestration, and biodiversity habitat. These benefits far exceed the costs of restoration when calculated over the long term.
The Role of Technology and Innovation
Modern technology offers new tools for combating desertification. Remote sensing and satellite imagery enable monitoring of land degradation at unprecedented scales, allowing for early detection and targeted intervention. Geographic information systems help in planning restoration efforts and tracking progress.
Innovations in agriculture, such as drought-resistant crop varieties, precision irrigation, and soil amendments, can help maintain productivity while reducing pressure on land resources. Mobile technology enables farmers to access weather information, market prices, and agricultural advice that can improve their land management decisions.
Climate Change Adaptation and Mitigation
Addressing desertification must be integrated with broader climate change adaptation and mitigation strategies. As climate change continues to alter precipitation patterns and increase temperatures, dryland communities will need support to adapt their land management practices to changing conditions.
At the same time, restoring degraded drylands represents a significant opportunity for climate mitigation through carbon sequestration. The vast extent of degraded drylands means that even modest improvements in carbon storage per hectare can result in substantial global climate benefits.
Key Impacts and Challenges
- Loss of agricultural productivity: Declining crop yields and reduced grazing capacity threaten food security for billions of people dependent on dryland agriculture
- Increased poverty: Land degradation traps communities in cycles of poverty as their primary productive asset loses value and productivity
- Migration and displacement: Environmental refugees fleeing degraded lands create social and economic pressures in receiving areas
- Decreased water resources: Falling water tables and reduced surface water availability affect both human consumption and agricultural production
- Biodiversity loss: Unique dryland species and ecosystems face extinction as habitats degrade beyond their capacity to support life
- Soil erosion: Billions of tons of fertile topsoil are lost annually to wind and water erosion, removing the foundation for future productivity
- Climate feedback loops: Desertification contributes to climate change through reduced carbon storage and altered surface albedo, which in turn accelerates further degradation
- Health impacts: Dust storms, water scarcity, and food insecurity create direct and indirect health consequences for affected populations
Conclusion: An Urgent Global Priority
Desertification represents one of the defining environmental and humanitarian challenges of our time. With billions of people living in vulnerable drylands and climate change accelerating degradation processes, the urgency of action cannot be overstated. The consequences of inaction extend far beyond the immediate areas of degradation, affecting global food security, climate stability, and human migration patterns.
Yet there is reason for hope. The knowledge, technologies, and practical solutions needed to combat desertification exist and are being successfully applied in communities around the world. What is required now is the political will to scale up these solutions, the financial resources to support implementation, and the commitment to empower local communities as the primary agents of change.
The fight against desertification is inseparable from broader efforts to address climate change, protect biodiversity, and achieve sustainable development. Success will require coordinated action across multiple scales, from international cooperation and national policy frameworks to community-level implementation and individual land management decisions.
As the global community works toward ambitious targets for land restoration and degradation neutrality, the experiences and innovations emerging from affected regions offer valuable lessons. By combining traditional knowledge with modern science, engaging communities in decision-making, and maintaining long-term commitment to sustainable land management, it is possible to reverse desertification and build resilient dryland ecosystems that can support thriving communities for generations to come.
For more information on global efforts to combat desertification, visit the United Nations Convention to Combat Desertification and explore resources from the IPCC Special Report on Climate Change and Land. Organizations like the World Resources Institute provide valuable data and analysis on land degradation trends, while FAO’s sustainable land management resources offer practical guidance for implementation.