一些细小的变化可能更危险，比如南方海域吸收二氧化碳的能力最近下降了。
Some smaller changes are arguably more ominous, like a recent drop in the southern seas' ability to absorb carbon.
一个可能的解释是存在一个缓慢的大气二氧化碳浓度的下降，始自3百万年前。
One possible explanation is that there was a slow decline in the concentration of carbon dioxide in the atmosphere, starting around 3 million years ago.
他说，环境规划署高兴地看到中国二氧化碳排放量正在逐年下降。
He said that UNEP is delighted at the gradual reduction of carbon dioxide emissions in China.
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