But it might learn from Toronto, which emits 11.6 tonnes of carbon dioxide per person and is closer to Denver in climate and population density.

但是丹佛可以参考多伦多的做法，因为两座城市气候和人口密度更为相近，而多伦多的人均二氧化碳排放量只有11.6吨。

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Conversely, when atmospheric carbon dioxide is low, stomatal density tends to increase - it's like getting more mouths to breathe with.

相反，当大气二氧化碳浓度低时，气孔密度似乎增加了——就像长出更多的嘴来呼吸。

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The density profile and the free energy profile of carbon dioxide have a "mirror symmetry", where the high density coincides with the free energy well.

二氧化碳的密度分布和自由能分布有一个明显的“镜面对称”的结构，高密度区域对应自由能的深阱。

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The density of water molecules within the leaf is typically 60 times greater than the density of carbon dioxide in the air, and the diffusion rate of the water molecule is greater than that of the carbon-dioxide molecule.

WSJ: Harrison H. Schmitt and William Happer: In Defense of Carbon Dioxide