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Được nói trong 3 đoạn từ 2 kênh · B2–C1 · các dạng khác: darkened
Factories and homes darkened the skies and the smoke from coal blackened everything.
And there is a risk that clouds might darken rather than brighten, reducing the cooling effect.
The particles would need constant replenishing and the scale would be enormous and there is a risk that clouds might darken rather than brighten, reducing the cooling effect.