Aridness

: Larger organisms (macrofauna) are often more adapted to aridity than microbes, acting as the primary recyclers in hot, moisture-deprived habitats. The Urban Challenge

: Over 2.3 billion people currently live in drylands, a population that has doubled in the last three decades and is projected to reach 5 billion by 2100.

: A phenomenon where loss of vegetation cover leads to isolated, highly specialized plants. aridness

This report explores the concept of —long-term climatic dryness—as a silent but powerful force reshaping the planet's landscapes and societies. The Global State of Aridity

: Arid zones now cover approximately 40.6% of the world's land area (excluding Antarctica). This is a significant increase from 37.5% just 30 years ago. : Larger organisms (macrofauna) are often more adapted

Cities in arid regions, such as Phoenix, Athens, and Kabul, face unique existential threats.

: Some plants utilize high calcium levels to strengthen cell walls against desiccation or high salt concentrations to reduce water loss through transpiration. This report explores the concept of —long-term climatic

: Arid cities often have very low tree cover (averaging 1.5%), but researchers from The Nature Conservancy suggest that targeted urban greening could reduce local air temperatures by up to 1.2°C.