การพัฒนาอย่างยั่งยืน, พลังงาน, แอปเปิ้ล, โลก, หญ้า, ทุ่งหญ้า, ใบไม้, ทดแทน, มนุษยชาติ, ด้วยกัน, ประชากร
Public Domain
ภาพถ่ายปลอดค่าลิขสิทธิ์ที่เกี่ยวข้อง
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