Chống hiệu ứng nhà kính bằng màu trắng
Bộ trưởng Năng lượng Mỹ Steven Chu hôm qua thông báo chính quyền Obama muốn phủ sơn màu trắng lên các mái nhà, đường xá và vỉa hè để giảm bớt tốc độ biến đổi khí hậu.
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