Làm mát trái đất bằng bóng bay
Cập nhật: 15:45 19/05/2012 GMT+7
Dự án phun nước vào tầng bình lưu (Spice) chủ trương phun những giọt nước nhỏ vào tầng khí quyển từ một quả bóng bay bị “xích” với mặt đất.
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