Desertification is not the expansion of deserts, but the loss of life-sustaining land.

Nature · Published 30 September 2026 Swipe more like this →

In short: Contrary to popular belief, desertification does not mean existing deserts are physically growing. Instead, it is the silent, global degradation of drylands—the fertile regions where billions live. Driven by climate change and unsustainable human practices, this process threatens to displace millions and destabilize the world's most vulnerable communities.

Desertification is defined as the reduction of biological productivity in drylands—arid, semi-arid, and sub-humid areas that cover over 40 percent of Earth's terrestrial surface. While the term often conjures images of shifting sand dunes, the reality is a complex decline in land quality. This process is fueled by a combination of natural climate variability, such as extended droughts, and human activities including overgrazing, deforestation, and intensive irrigation. When vegetation is cleared or soil is over-farmed, the land loses its ability to retain water, leading to erosion and the eventual formation of unproductive hardpan.

The human cost is profound. Approximately 2 billion people currently live in vulnerable drylands, and the United Nations estimates that 135 million people could be displaced by 2045. The consequences extend beyond food insecurity; they include water scarcity, respiratory illness from dust, and the loss of biodiversity. In some regions, the economic impact is severe, with estimates suggesting a 10 percent loss of global GDP annually due to land degradation. This crisis is particularly acute in Africa and Asia, where subsistence farming is the primary livelihood for millions.

Efforts to combat this trend have evolved significantly. Early initiatives, such as large-scale tree planting, sometimes yielded mixed results, as seen with invasive species in East Africa. Today, the focus has shifted toward 're-greening'—empowering smallholder farmers to implement sustainable water-harvesting techniques, such as stone barriers, and nurturing natural vegetation regrowth. The United Nations Convention to Combat Desertification (UNCCD), established in 1994, now coordinates global efforts to achieve Land Degradation Neutrality. By shifting the perspective to view small farmers as essential stewards of the land, rather than the primary cause of its decline, scientists and policymakers hope to restore the resilience of these critical ecosystems.

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