पृथ्वी घंटा, पृथ्वी को बचाओ, प्रकृति की रक्षा करो, पारिस्थितिकी तंत्र, परिस्थितिकी, ग्रह, ग्लोब, पर्यावरण, जलवायु परिवर्तन, महाद्वीपों, प्रकृति
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