สิ่งแวดล้อม, การป้องกัน, การรีไซเคิล, การคุ้มครองสิ่งแวดล้อม, ความรับผิดชอบ, สัญลักษณ์, นิเวศวิทยา
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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