ηλιακός, στέγη, ενέργεια, ρεύμα, εναλλακτική λύση, ενεργειακή επανάσταση, την υπερθέρμανση του κλίματος, αλπικός, λόφους των Άλπεων, βουνά, χιόνι
Public Domain
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