Rethinking desert definitions: Bridging the gap between science, policy, and conservation

Area of Science:

• * Ecology and Environmental Science
• * Arid Land Studies
• * Geographic Information Science

Background:

• * Deserts are commonly misperceived as barren, leading to imprecise terminology like 'semiarid' and 'desertification'.
• * Ambiguity in desert definition and delineation hinders effective environmental policy and land management.
• * The term 'desertification' is often misused to mean desert expansion, rather than land degradation within arid regions.

Purpose of the Study:

• * To identify incongruencies between climatic and ecological desert classification methods.
• * To propose a more comprehensive desert classification system.
• * To advocate for a nuanced understanding of deserts to improve scientific and policy frameworks.

Main Methods:

• * Comparative analysis of existing climatic and ecological desert classification systems.
• * Geographic delineation of distinct desert regions based on integrated criteria.
• * Identification of discrepancies in global desert mapping.

Main Results:

• * Significant discrepancies were found between climatic and ecological desert classifications.
• * Nearly 12 million km² of distinct, non-overlapping desert regions were identified globally.
• * Current definitions obscure the extent and nature of deserts and land degradation within them.

Conclusions:

• * A new, comprehensive desert classification is essential for effective policy and conservation.
• * Refined understanding is critical as human pressures accelerate land degradation in drylands.
• * Challenging misconceptions about deserts and desertification is vital for strengthening scientific and policy frameworks.