The varied range of CO2 concentrations in vegetation air system are mainly influenced by the amount of rainfall, secondly the rain frequency.

浓度降低的幅度主要取决降雨量的大小，其次才是降雨的频率。

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It is found that the carbonization velocity coefficient will not be constant but increased with the elevation of CO2 concentrations resulted from the air pollution.

分析发现，随着大气中CO2浓度的升高，混凝土碳化速度系数不再是一个恒定的量，而是随时间延长不断增大，表明大气污染会加剧混凝土的碳化。

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The results showed that the interaction of doubled CO2 concentrations with drought stress reduced the water consumption and transpiring rates of the saplings effectively.

结果表明，在各干旱胁迫水平下，CO2浓度倍增有效地降低了幼树的蒸腾耗水量和耗水速率。

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They were represented to purport a direct causal fit, suggesting that increased atmospheric CO2 concentrations produce warming.

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If carbon dioxide (CO2) emissions continue at current rates, atmospheric CO2 concentrations are expected to double by 2050.

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Without feedbacks we know very well what the effects of higher CO2 concentrations in the atmosphere are: pretty much nothing.

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