But the first order effect is the absorption and emission of radiation by water vapor, i.e., the greenhouse effect. (realclimate.org)
The obsession with merit order effect of point of use solar seems to be indicative of a one trick pony. (johnquiggin.com)
As another example; when you put a light bulb inside an optical integrating sphere you can observe a third order effect known as «self absorption». (climateofsophistry.com)