Using the Raman lidar for monitoring the atmospheric CO2 concentration is an advanced technique.

拉曼雷达测量大气中CO2气体含量是一种技术先进的可靠方法。

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With CO2 concentration enrichment, the leaf stoma density becomes small for C3 crops, but it shows the opposite tendency for C4 crops (maize).

随着CO2浓度升高，C3作物叶片气孔密度变小，C4作物（玉米）呈相反趋势；

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The results show that CO2 transfer rate increases with increasing electrical current density and CO2 concentration difference across the membrane.

解的结果表明： 影响CO2 传质通量的因素主要有电流密度及CO2在膜两侧的浓度差。

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The warming effect is similar to that predicted from an elevation of the atmospheric CO2 concentration to 720 ppm.

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Those who pay honest attention to long-term climate patterns will note that atmospheric CO2 concentration fluctuations do not lead, but typically follow, temperature changes.

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However, this does give us the chance to mark the ongoing increase in CO2 concentration and talk about why it's a problem for the climate.

BBC: Carbon dioxide passes symbolic mark