Atmospheric concentration of CO2 as a function of altitude

Note that water vapor is essentially at zero concentration above the tropopause, which is at most 16 km high (it varies with latitude and season) because it is too cold for water to survive as gas, or even as liquid. In contrast, direct measurements have shown that CO2 persists, and even varies with concentrations at lower altitudes. See
figures below.
(Click on image for larger graphic.)
(Click on image for larger graphic.)

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