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They do, but not to the extreme that $\ce{O3}$ does. For reference, there is $\ce{O3}$ near the ground, but the $\ce{O3}$ in the stratosphere is amplified by the Chapman cycle that forms it. Generally, greenhouse gases have the highest concentration in layers where they are generated. Let's think about a few (not all) of the greenhouse gases, their sources, ...


2

The Earth's atmosphere has a mass of about 5.15×10^18 kg or 5.15 Quadrillion Metric tons, CO2 human outputs since start of the Industrial revolution amount to 654 billion tons, or 1/7,800 th of it's overall mass. Also CO2 emissions came from consuming existing atmospheric oxygen. The Carbon that was added using stoichiometric calculations; Only 27% of CO2's ...


1

We have issued around 200 ppm of CO2. That means 0,02 % of the atmosphere. Furthermore the combustion reaction consumes O2. Also part of the CO2 dissolves in the ocean because of Henry's law. The variation of atmospheric pressure due to industrial activity is negligible, much less than 0,02%.


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