概括段意并补全句子：Paragraph⑦_____ASoot's Role in Climate Changes Above Oceans and LandBObservation

题目内容：

Paragraph⑦_____

Soot's Role in Climate Changes Above Oceans and Land

Observations of Warming in the Northern Hemisphere

Explanation of Increased Warming Effect Caused by Soot

Black Soot in Snow and Icy Areas Leading to Climate Change

Black Soot Contributing to Global Warming

Greenhouse Gases as the Main Factor of Global Warming

答案解析：

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