以下为句子列表：
英文: Before the beginning of the seventies, in a first approximation, the carbon cycle due to energy production was closed, in an equilibrium situation until human activities did start to tilt the balance.
中文: 在上个世纪七十年代开始之前，由于能源生产的碳循环在人类的活动使其失去平衡前首次接近平衡状态。
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