大气中的二氧化碳浓度正在上升，气候变化正在发生，这些都缘于人类活动…。
The concentration of carbon dioxide in the atmosphere is rising and climate change is occurring, both due to human actions...
相反，当大气二氧化碳浓度低时，气孔密度似乎增加了——就像长出更多的嘴来呼吸。
Conversely, when atmospheric carbon dioxide is low, stomatal density tends to increase - it's like getting more mouths to breathe with.
根据设在北极的一个世界公认的测量站最新公布的数据，大气中的二氧化碳浓度已经创了新高。
The concentration of carbon dioxide in the atmosphere has reached a record high, according to the latest figures released by an internationally regarded measuring station in the Arctic.
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