这比全球交通运输业的总排放量还要大。
That’s more than what is produced by transportation worldwide.
而这仅预计是因人类活动而造成的总排放量的2%。
That is about 2% of the estimated total of emissions from human activity.
航空业的碳排放量占到总排放量的3%，但这一比例正迅速增长。
Air travel is responsible for about 3 percent of greenhouse gases, but their share of global emissions is rising rapidly.
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