Solution
Save water through clever soil watering

In the biggest parc right at he university in Santander the soil watering is being controlled through humidity sensors, to save drinking water during summertime.

Photo: Tecsie (Augusto Sisa) (Eigenes Werk) [CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons

 
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