Revision summary
Desertification is land degradation, not only the existence of a desert climate. UNCCD already includes semi-arid and dry sub-humid lands. Thar salinity and grazing push barrenness beyond dune cores. The Sahel and Aral cases show drought plus policy, not a sealed climate wall. Process follows soil and use, so it crosses climate boundaries.
Model answer
Introduction
Desertification is the persistent degradation of drylands, but the process does not stop at a rainfall isohyet. Bad land use can desertify a semi-arid margin, and even wetter belts, while good management can hold a desert edge. Climate sets a risk. It does not draw a legal fence.
Body
Why climate is not a boundary
- UNCCD treats desertification as land degradation in arid, semi-arid, and dry sub-humid areas. The definition already crosses ‘true desert’ into farm and savanna.
- Overgrazing, salinisation, groundwater mining, and deforestation can push land across a threshold even when rainfall has not become Saharan.
- Conversely, irrigation and enclosure can green a desert margin without a climate-zone change on the map.
Examples
- Thar: Rajasthan’s arid core is climatic, but canal-side waterlogging and salinity, plus grazing pressure on the Gujarat–Haryana fringe, spread desert-like soils beyond the old dune line.
- Sahel: the 1970s–80s famines mixed drought with overcultivation and herd pressure. Recovery and new degradation have both occurred under similar rainfall bands. The boundary moved with use, not only with ITCZ.
- Aral Sea basin: Soviet irrigation of cotton in a dry climate collapsed a sea and salted farm belts. The disaster is hydropolitical, not a new Köppen class arriving from the west.
- Himalayan rain-shadow and Western Ghat rain-shadow pockets, plus mined laterite plateaus, show barrenness inside monsoon India.
Justification
- Climate zones are averages. Desertification is a process of soil, vegetation, and people. It therefore leaks across maps wherever the land is pushed.
Flow diagram
flowchart TD C[Climate risk] --> D[Dryland] L[Land use water mining] --> D D --> T[Thar fringe] D --> S[Sahel] D --> A[Aral basin]
Conclusion
Desertification has climatic preference, not climatic borders. Thar fringes, the Sahel, and the Aral basin justify the claim: misuse and water politics can manufacture desert conditions outside the textbook desert.
Quick related
Students also ask
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How will the melting of Himalayan glaciers have a far- reaching impact on the water resources of India?
Next question in the 2020 paper (Q6). View answer →
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Can wet regions desertify?
True humid forests do not become Sahara overnight. They can still lose soil and become barren. The exam point is that the process is not fenced by a climate line.
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Is climate change irrelevant?
No. It raises drought risk. The justification is that human land use can desertify even without a zone change.
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