343 Jesús Areso Salinas - Building towers to trigger rain, to help nature sweat and cool

A conversation with Jesús Areso Salinas, retired from work as patent examiner at the European Patent Office and now active with his project to fight climate change combining water, katabatic tower and mosture. Another record-breaking summer in the global north, where temperature records were shattered repeatedly, prompts us to ask: is there a sustainable future for places like the Mediterranean? Jesús wondered how does nature cool? and, crucially, could we help nature kickstart the cooling of ambient air?”

Imagine cooling our surroundings during a heatwave—cooling town squares, vegetable gardens, or farms on a small scale. What if, over time, this approach spreads, with more people cooling their surroundings, allowing plants and trees to continue growing through the summer and helping to cool the air? Could this restoration of local cooling contribute to rebalancing water cycles, bringing back summer rains, and even creating a lasting cooling effect? 

Sure, we could retreat to air-conditioned spaces, but air conditioners only worsen the problem by using energy to move heat from inside to outside without solving anything at its core. And what about plants, trees, and animals? They need a humid, comfortable environment to thrive, yet during hot, dry summers, they’re focused on survival rather than growth—or the cooling process essential to their function. Mediterranean farmers, in particular, take note: during the peak of summer, your plants and trees often stop growing because it’s too hot and dry.

So, how does nature cool itself? Through transpiration, plants and trees release moisture, which cools the surrounding air. However, as heatwaves become stronger, it’s often too hot for them to function, meaning they can neither grow nor cool the air. This lack of cooling is a problem farmers and investors need to understand—especially those in warmer climates, where plants and trees may be unable to photosynthesize or grow for weeks on end. Cooling ambient air is essential, and air conditioning isn’t the answer.

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