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I have no idea how much CO2 the average person exhales per day, but just assuming our average methane belches are a meer one liter per day. that's 6.6 billion liters or 233 MCF of methane per day. or enough to run a 1400 megawatt state of the art combined cycle generating station round the clock. Methane is 21 times more effective as a green house gas as CO2. or equivalent to 5 BCF per day of CO2, plus what we exhale must be much more. Anybody know how much?
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We aren't ruminants so we don't belch methane and most farts have little if any.
The C in the CO2 we exhale comes from our food and the C in our food originally came from CO2 via photosynthesis (even if you're eating meat). We exhale less CO2 than the plants originally took up so there is no net increase in atmospheric CO2 as a direct result of respiration unless we eat food faster than it can grow.
Now, land use changes to produce that food can have a big impact on CO2.