Layman struggles with Science

[Richard S Courtney.]

Richard111:

You seem to have a misunderstanding when you say:

"For instance, the DRY adiabatic lapse rate is constant for any level of water vapour until the dew point temperature is reached.
This seems to indicate CO2 will have no effect in dry air."

No.  A fixed dry adiabatic lapse rate is used in some models as a simplifying assumption.

Please remember that the lapse rate results from a mechanical effect (i.e. warm air rises and expands - so cools - as it rises) but greenhouse warming is a radiative effect.

Richard