Meanwhile, over at RealClimate

"One way to view the greenhouse effect is the vertical distance between the place where incoming energy is deposited and where the average outgoing heat loss takes place. This distance depends on the concentration of greenhouse gases, and at what height the OLR can escape to space without being reabsorbed by air above..." 
An interesting piece:

What is the best description of the greenhouse effect?

http://www.realclimate.org/index.php/archives/2016/02/what-is-the-best-description-of-the-greenhouse-effect/

And, a post with links to some on-line climate science and modeling classes...

http://www.realclimate.org/index.php/archives/2016/02/new-on-line-classes-and-models/