UC San Diego engineers developed a fiber membrane that removes heat via passive evaporation for cooling electronics and data centers. Published in Joule, this method offers a low-energy alternative to fans and pumps, potentially halving cooling energy requirements. The membrane’s porous structure facilitates liquid transport and evaporation without external power. This scalable solution addresses rising demands from AI and cloud data processing, aiming to curb data center energy and water use significantly by 2030.