Scientists are alarmed that CO2 levels keep rising because the climate was much warmer then.

Scientists are alarmed that CO2 levels keep rising because the climate was much warmer then.

题目
Scientists are alarmed that CO2 levels keep rising because the climate was much warmer then.
上句后半部分意思到底是现在暖和还是以前?如果是以前,哪co2怎么会持续上升呢?
答案
现在暖和,CO2浓度上升的话造成温室效应
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