ηπείρους, φυσικό απόθεμα, περιβάλλον, την προστασία του περιβάλλοντος, οικολογία, πράσινο φόντο, Ιστορικό, Γίνε πράσινος, ενέργεια, βιωσιμότητα, οικολογικό σύστημα
Public Domain
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