ABSTRACT: In any meaningful thermodynamic discussion it is necessary at the outset to clearly define the parameters of the “system” under study. One of those parameters is whether or not the system is “closed”.
The typical explanation of the “greenhouse effect” hypothesis pulls a slight of hand in this regard in that it starts out describing the thermodynamics of one “system” with an emphasis on the first law of TD, but then switches twice midstream to different “systems” altogether and asserts that the thermodynamics of the second and third systems mirror the thermodynamics of the first system.
If you are already confused you are not alone. The “greenhouse effect” hypothesis is itself very confused. Let’s explore.
First system
The first system is the Earth/atmosphere ensemble, whose “boundary” is space and whose two thermal energy sources are 1) incoming sunlight and 2) internal nuclear decay.
This is, indeed, a “closed” system in that for all practical purposes there is no movement of matter into or out of the system that would carry thermal energy with it into or out of the system. (For the sake of this discussion we will neglect the energy added to the system by meteors and lost from the system by the outer atmosphere as it continually loses molecules blown out into space by the solar wind.)
In this system the thermal energy that crosses the “boundary” between the system and its surroundings is 100{154653b9ea5f83bbbf00f55de12e21cba2da5b4b158a426ee0e27ae0c1b44117} electromagnetic. There is absorbed sunlight (insolation – albedo) in and long-waver IR radiation out.
According to the first law of thermodynamics for this entire Earth/atmosphere ensemble system to be in thermal equilibrium the total energy contained within the sunlight absorbed must equal the total energy contained within the outgoing long-wave radiation.




I knew it deserved to be read not just by the hundreds of thousands of people who are now reading and sharing it. I knew it deserved to be in newspapers around the world. 






My dearest is excited too: finally, she will no longer have to remind me of my chores, that the (yet to be acquired super-duper) robot with its well-programmed memory and a mind of its own will perform without being asked—and even without any snarky comments on the side.

Salt water is great for ocean dwellers but not directly useful for most life on land. Another 2{154653b9ea5f83bbbf00f55de12e21cba2da5b4b158a426ee0e27ae0c1b44117} of Earth’s water is tied up in ice caps, glaciers and permanent snow, leaving just 1{154653b9ea5f83bbbf00f55de12e21cba2da5b4b158a426ee0e27ae0c1b44117} as land-based fresh water.