If we are putting more greenhouse gasses into the atmosphere by burning captured carbon, why are we not raising the world’s air pressure?

Question

We are continuing to add carbon and all sorts of elements into our atmosphere by burning fossil fuels. If we are actively adding more gasses into the air, are we “pumping” our atmosphere up like a tire as a result? Or are we just reducing the amount of free oxygen in the air by combining it with carbon?

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Answer 1

I am no expert but from what I can comprehend, we are not creating “new atoms,” instead we are creating molecules from atoms that are already present in the earth – thus no new molecules of carbon dioxide are actually produced. We are simply transforming available carbon and oxygen atoms into carbon dioxide and other complex molecules.