Passive subambient cooling and atmospheric water nexus.

Fang, Sunmiao; Dang, Saichao; Yang, Kaijie; Zhou, Lyu; Ahmad, Shakeel; Zhang, Yan; Li, Qiong; Li, Qiang et al. · Nat Commun · 2026

review · Level V

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Abstract

Accelerating global warming has intensified the need for sustainable, low-energy cooling strategies. Subambient radiative cooling is a compelling solution, passively dissipating heat to outer space via mid-infrared emission without external energy input. However, its performance depends on atmospheric conditions, especially low humidity and clear skies. Although its global potential is well-established, its performance under typical weather conditions and integration with sustainable water cycling technologies remain underexplored. This review examines how radiative cooling can be integrated with water-related technologies-including atmospheric water harvesting, sustainable agriculture, and radiative-evaporative cooling-to reduce thermal loads while improving water sustainability.