Not sure what you're talking about. So you don't get confused I'm taking John Tyndall's thoughts on GHGs as pretty sound. His view was that water vapour was the major GHG.
I ought to explain the lengths some climate scientists will go to keep their theory valid. Their treatment of the effectiveness of H2O versus CO2 as a greenhouse gas is BAFFLING. I’ll use only one source, but you should be aware that there are innumerable sources playing down the role of H2O as a greenhouse gas. A whole variety of reasons are put forward, one being water vapour doesn’t last long enough in the atmosphere to be a viable greenhouse gas.
For sure individual molecules of water in the form of water vapour don’t last long in the atmosphere compared to CO2 but you don’t need a PhD from Harvard University to figure out that if the sun is shining, or it is warm, the H2O in the atmosphere will be continuously replenished, especially around the equatorial regions where most of the heat from the Sun hits the planet.
"Heat escapes from areas just north and south of the equator, where warm surfaces fewer clouds allow for greater radiative cooling into space." NASA.
John Tyndall figured this out, and anyone with the most basic knowledge of physics would be able to. It is the most scientifically limp wristed attempt to divert the known science, - that could possibly be put forward - i.e. the known science that the most abundant and powerful greenhouse gas is water vapour. So, let’s look at the data.
Here are the overnight temperatures for the Sahara and Arabian deserts. Let’s see how much heat is retained in CO2 rich atmospheres with and without water vapour.
Sahara Desert, humidity 25%
Daytime temperature 38C. Overnight temperature -4C,
Drop in temperature 42C (Source NASA)
Arabian Desert, humidity 21%
Daytime temperature 48C. Overnight temperature -3C
Drop in temperature 51C (Source NASA).
CO2 is a well-mixed gas and is found in roughly the same volume throughout the atmosphere. There is little water vapour to speak of in the atmosphere of these deserts, and the temperatures have dropped dramatically as soon as the Sun has gone down.
“The temperature in the desert can change drastically from day to night because the air is so dry that heat escapes rapidly at night. The daytime temperature averages 38°C while in some deserts it can get down to -4°C at night.”
NASA Earth Observatory
In the more humid areas around the equator with 80% humidity the drop in temperature is manifestly far less dramatic.
Bangkok humidity, 80%
Daytime 32C to night time 27C drop in temperature of 5C. (Source NASA)
Singapore humidity, 84%
Daytime 32C to night time 24C
Drop in temperature of 8C. (Source NASA).
It can be seen quite clearly from these figures that water vapour dominates the greenhouse gas effect on the Earth, it is around a variable 40,000 parts per million (ppm), in the tropics (roughly 100 times that of CO2) and almost non-existent over deserts and at the poles.
NASA’s comment, where, “because the air is so dry that heat escapes rapidly at night,” tacitly agrees that CO2 is a bit part player in global warming.
John Tyndall supported the notion that “water vapour is the most powerful greenhouse gas with other gases (including CO2) as “not negligible but relatively small.”
“If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts he shall end in certainties.” Sir Francis Bacon in praise of scepticism.
Surely you'll take the word of the man who invented the world's greatest breakfast over a bunch of alarmist scientists?
Hang on buddy. First you say there’s no greenhouse effect, and now you’re saying CO2 has a non zero climate sensitivity. Which one is it? Can’t have it both ways champ.