Trái đất trên đà tăng thêm 4 độ C
Các nhà khoa học lại vừa đưa ra một cảnh báo mới về một thế giới ấm hơn 4 độ C không còn là tương lai xa và điều đó sẽ làm cho hạn hán trên khắp địa cầu ngày càng trầm trọng hơn, khiến hàng triệu người phải tìm kiếm nơi tị nạn khi các nguồn cung cấp lương thực cạn kiệt.
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