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Geography Optional 300+ Score Pack · Model answer

How does climate change affect the process of desertification of India?

  • UPSC 2015
  • Contemporary Issues

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Desertification is land degradation in arid, semi-arid and dry sub-humid areas, and membership of those classes is fixed by the aridity index, AI = P/PET — mean precipitation over potential evapotranspiration, computed on the Charles Warren Thornthwaite or Howard Latimer Penman formulation. Drylands are AI below 0.65: arid 0.05-0.20, semi-arid 0.20-0.50, dry sub-humid 0.50-0.65.

You are reading the opening of the model answer. The full answer is part of the Geography Optional 300+ Score Pack.

What the full answer covers

  • The Variable Climate Change Actually Moves
  • Link One: Warming Raises PET, So Aridity Rises Even If Rainfall Does Not Fall
  • Link Two: The Same Rainfall, Delivered Worse
  • Link Three: The Feedback That Makes It Self-Sustaining
  • Weighing It
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