pinwheel, windräder, αιολική ενέργεια, ενεργειακή επανάσταση, ουρανός, ρεύμα, παραγωγή ηλεκτρικής ενέργειας, τοπίο, προστασία του κλίματος, φύση, σύννεφα
Public Domain
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