Photographer Tommy Trenchard documented the struggle to preserve oases across Chad as encroaching Saharan sands threaten these vital ecosystems. The photo essay, published in New Scientist, captures both the environmental crisis and conservation efforts underway in the region.
Oases represent fragile island ecosystems within the desert, supporting unique plant and animal communities that depend on underground aquifers and limited water sources. In Chad, these sanctuaries face mounting pressure from desertification, driven by climate change, overgrazing, and unsustainable water extraction. The advancing sand dunes gradually bury productive land, reducing the area available for agriculture and livestock grazing that local communities depend on for survival.
Trenchard's images reveal the stark visual reality of this environmental encroachment. The photographs document both the natural forces at work and human responses, including dune stabilization projects and attempts to restore vegetation. Communities in Chad employ traditional and modern techniques to combat sand advance, such as planting trees, constructing barriers, and managing water resources more carefully.
The oases of Chad hold ecological and cultural importance beyond their immediate region. They serve as habitat for migratory bird species and harbor plant varieties adapted to extreme conditions. For local populations, oases provide food security, water access, and economic resources in an otherwise harsh environment.
Climate scientists link increasing desertification rates in the Sahel region to broader patterns of warming and shifting precipitation. Projections suggest these pressures will intensify in coming decades without substantial intervention. The challenge facing Chad reflects a broader crisis across North Africa, where multiple oases face similar threats.
Trenchard's documentation provides visual evidence of environmental change happening in real time, offering perspective on how climate pressures reshape landscapes and threaten vulnerable communities. The work highlights both the scale of the challenge and the determination of those working to preserve these ecosystems before they disappear entirely.
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