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
Copper italics in this answer — like this — are the key facts. Each one is unpacked in the Facts & figures rail.
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
-
The interlinking of revivers can provide viable solutions to the multi-dimensional inter-related problems of droughts, floods and interrupted navigation. Critically examine.
Next question on this syllabus topic (2020 · Q14). View answer →
-
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.
-
Is climate change irrelevant?
No. It raises drought risk. The justification is that human land use can desertify even without a zone change.
Same topic · past papers
UPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.
-
2026 · Q6 · GS I · 10 marks
Discuss the role of aeolian processes in desertification and land degradation.
More from this topic
Q15 · UPSC Mains 2026 · GS I · 15 marks · Solution
Analyze the role of satellite-based technologies in achieving climate-smart agriculture and food security in India.
Geophysical Phenomena
Satellite-based technologies are transforming Indian agriculture from a monsoon-dependent gamble into a precision
Q4 · UPSC Mains 2026 · GS I · 10 marks · Solution
What is the Fujiwhara effect? Explain its impact on the movement and intensity of tropical cyclones.
Geophysical Phenomena
The Fujiwhara effect occurs when two neighboring tropical cyclones rotate cyclonically around a common center due to interacting vortex dynamics. It alters the standard movement of cyclones, causing trajectories to deviate, merge, or orbit each other. In terms of intensity, the interaction can suppress the weaker storm while potentially energizing the stronger one. Understanding this phenomenon is vital for improving cyclone track forecasting in regions like the Northwest Pacific and the Bay of Bengal. Meteorological agencies use advanced numerical models to predict these complex binary cyclone interactions. Proper tracking mitigates coastal disaster risks by providing timely warnings for erratic landfall paths.
Q7 · UPSC Mains 2025 · GS I · 10 marks · Solution
What are Tsunamis? How and where are they formed? What are their consequences? Explain with examples.
Geophysical Phenomena
A tsunami is a train of long ocean waves caused by sudden motion of the seafloor. Most begin on subduction megathrusts; landslides and volcanoes can also trigger them. In deep water they are fast and low; near shore they flood. The 2004 Sumatra quake devastated the Andamans, Tamil Nadu, Sri Lanka, the Maldives and coasts as far as Africa. Warning systems work only with drills, and mangroves take some of the blow. The Makran zone remains a local tsunami source for India’s west coast.