This passage is mainly about how the development of airline industry has affected the environment through its greenhouse gases e

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问题 This passage is mainly about how the development of airline industry has affected the environment through its greenhouse gases emission.
______as a whole was judged to be responsible for about a quarter of the world’s carbon dioxide discharges.

选项

答案Transport

解析 在第三部分Counting the cost第一段明确提到了答案。
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