Dân số thế giới sẽ đạt ngưỡng 7 tỷ người vào năm tới
Dự báo của nhóm nghiên cứu Liên hợp quốc và Mỹ cho rằng dân số thế giới sẽ lên tới 7 tỷ người vào năm 2011, chủ yếu do dân số ở các nước đang phát triển tăng mạnh...
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