As a result of global warming, soils are expected to release more carbon dioxide, the major greenhouse gas, into the atmosphere, which, in turn, creates more warming. Climate models try to incorporate these increases of carbon dioxide from soils as the planet warms, but results vary greatly when realistic estimates of black carbon in soils are included in the predictions, the study found.
If CO^2 has to be in the upper atmosphere to have any real effect; and CO^2 is heavier than air, then isn't most or all of the CO^2 from the soil either retained in the soil, or utilized by plants growing in or on that soil, with little of it reaching an effective altitude?
Naturally, surface wind mixing occurs, etc.; but, what is releasing the CO^2 (not forming it) from the soil into the atmosphere?
You're expecting a serious answer from me? Ha ha ha ha ;-)