It is estimated that ______ square km land has been converted to unproductive deserts in the last 50 years:
Correct answer: A. 3.7 million
- A. 3.7 million
- B. 3.8 million
- C. 3.9 million
- D. 4 million
Explanation
The commonly cited estimate is about 3.7 million square kilometres converted into unproductive desert during the preceding 50 years. This figure is used to illustrate the scale of land degradation and desertification.
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