Doug, on your website (http://www.climate-change-theory.com/) you are simply describing the known phenomenon of "lapse rate" arising from convective atmospheric cooling with a heated surface in a gravitational field:
This in no way disproves the separate known phenomenon of greenhouse warming of a planetary surface. You cannot disprove something by asserting that something else also occurs. (You also confuse atmospheric temperature gradient with mechanisms establishing the earth-surface temperature.)
The correct calculation of earth's mean surface temperature takes both convective cooling (of the surface) and radiation-balance (including greenhouse effect) into account, as here:
Find a fundamental physics error in the latter calculation, then you will have made a "great discovery".
The small group of deniers that insists that the planetary greenhouse effect mechanism itself does not exist is wrong. Completely wrong. It is the dominant mechanism of earth-surface warming above the no-atmosphere value. There is no doubt about this. The statement of "no warming from a greenhouse effect in the atmosphere" is correctly viewed as crazy and does a disservice to the debate about warming.
"A little knowledge is a dangerous thing"...