Toàn cầu đang ngày càng sáng lên
Sau nhiều năm cố gắng làm giảm lượng khói ô nhiễm, bầu trời của chúng ta trở nên quang đãng hơn từ khoảng năm 1990. Và một tác động theo sau đó là bức xạ mặt trời nhiều hơn đang chiếu thẳng xuống bề mặt Trái đất.
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