"CO2 is expelled by our bodies, it doesn't fuel our bodies"
Incorrect!
CO2 is absorbed by plants, which we then eat to fuel our bodies.
CO2 is absorbed by plants, which are then eaten by steak and wings, which in turn gives us steak, wings, eggs, milk, etc., which we then eat to fuel our bodies.
CO2 is absorbed by plants, which then release oxygen for us to breath.
You see, simple science is obscured completely by your liberal ideology, to the point where you literally miss the obvious.