Quả bom hẹn giờ của khí hậu
ếu tầng đất đóng băng tan chảy hoàn toàn do biến đổi khí hậu, hàng nghìn tỷ tấn carbon sẽ được giải phóng vào không khí khiến nhiệt độ trái đất tăng nhanh hơn nhiều so với hiện tại.Tầng đất đóng băng vĩnh cửu chứa nhiều carbon hơn bầu khí quyển. Ảnh: treehugger.com.Tầng đất đóng băng bao phủ xấp xỉ 20-25% bề mặt đất liền ở bán cầu bắc. Theo tính toán của giới khoa học, đất đóng băng vĩnh cửu chứa tới 1.600 tỷ tấn carbon (chủ yếu ở dạng chất hữu cơ).
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