Global Deserts: Formation, Distribution, and Desertification

Status: draft · Confidence: medium (0.625) · Basis: verified_sources

Quality notes: placeholder_content

## TL;DR

Deserts cover 33% of land (precipitation <250mm/yr). Form at 30° latitude (Hadley subsidence), rain shadows, cold coasts. Desertification affects 250M directly, threatens 1B. Sahara (9.2M km²) largest hot desert, expanded 10% since 1920.

## Core Explanation

Formation: subtropical (Hadley cells), rain shadow (Atacama, Gobi), coastal (Namib), continental interior. Atacama driest non-polar — some stations never recorded rain. Great Green Wall (Sahel, 2007): restore 100M hectares. Sahara 20,000-year cycle driven by Earth axial precession — was savanna 10,000 years ago.

## Detailed Analysis

[待后续补充。]

## Further Reading

- [Source 1 — Global Deserts: Formation, Distribution, and Desertification](https://www.usgs.gov/special-topics/)

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