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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The diurnal variation of Pn in hebei-walnut was influenced by light intensity, leaf temperature and intercellular CO2 concentration.

影响河北核桃净光合速率日变化的主要因子是光合有效辐射、叶片温度及胞间CO_2浓度。

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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 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.

FORBES: Magazine Article

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