½ thế giới chim nước biến mất
Gần ½ chim nước trên thế giới đã biến mất, đa phần do sự phát triển kinh tế nhanh chóng và tác động của thay đổi khí hậu, một cuộc khảo sát toàn cầu được công bố hôm qua, 23-1.
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