At issue is the balance between two natural phenomena. One is beneficial: as carbon-dioxide levels in the air rise, plants grow more quickly, absorbing more carbon in return.
问题的关键是两种自然现象之间的平衡，有利的一种是：随着空气中二氧化碳含量升高，植物生长得更快，回过头来吸收更多的碳。
At issue is the balance between two natural phenomena. One is beneficial: as carbon-dioxide levels in the air rise, plants grow more quickly, absorbing more carbon in return.
问题的关键是两种自然现象之间的平衡，有利的一种是：随着空气中二氧化碳含量升高，植物生长得更快，回过头来吸收更多的碳。
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