[Response: CO2 is effectively mixed throughout the full height of the atmosphere after a year or so, so I don't think that where CO2 is emitted makes any particular difference. (realclimate.org)
2) Failing to acknowledge that natural variations in the effective radiating height of the atmosphere occur all the time as a result of the ever changing balance between different non radiative processes within the atmosphere. (newclimatemodel.com)
The inappropriately - named «greenhouse» effect is actually the effect of absorption / emission of IR radiation due to radiatively - active gases combined with the effect of declining temperature with height of the atmosphere (lapse rate). (scienceofdoom.com)