Except the blanket ISN'T transparent. You are adding GREY specs that are very slightly LIGHTER than the average of the rest of the material.
1) Nitrogen and oxygen are transparent to IR, so for all intents and purposes, the "blanket" in this analogy is transparent too.
2) You are conflating heat capacity with spectral absorption. These are not even remotely related.
Yes, you can do that experiment, but you would need to compare it to regular atmosphere (with the average humidity taken across the entire planet). Do that, and you find that the difference is within the margin of error.
No, it most certainly is not. You take a transparent vessel, put a heat lamp in front of it, and stand on the other side. Normal air? You can feel the heat through the vessel. Fill the vessel with CO2 gas, and you immediately notice a significant reduction in the heat felt. You can quantify the decrease using IR sensors/FLIR cameras and plate thermometers. Very straightforward.
Water vapor absolutely does NOT trap IR the same way as CO2.
Thank you for basically repeating what I just said, glad we're in agreement.
CO2 has a thin, sharp, very tall peak, meaning it becomes saturated at low concentrations
Wrong on two levels.
For one, there's no concept of "saturation" at work here - CO2 will absorb ALL of the IR energy in the appropriate wavelengths. It's not like the molecules get "full" and let the rest of the IR pass through. The only factor that determines how much of the total radiation is absorbed is the density of the gas: More gas, more absorption.
For two, CO2 has three major peaks and one minor peak, not just one, and they aren't terribly sharp.
Oops, sorry, left the "nature" groups out. Go to the high desert where there are no people (and thus less CO2),
CO2 doesn't quite work that way. The atmosphere is constantly being mixed, especially at high altitudes, so the CO2 does not stay where it is generated for very long. That's what makes this a GLOBAL problem.
Deserts are cold at night because there's no mass to hold the heat. The sand does not hold much thermal energy and there is no entrapment of the radiation from other surfaces because it's basically flat. All emitted thermal radiation quickly escapes into the atmosphere instead of being trapped by buildings and trees.
This is another experiment you can try: Park your car overnight such that it is half under a tree. If it dips below the dew point overnight, you'll likely find that the parts of your car that have a clear view of the sky have more dew on them than the parts that can only "see" the tree, which may not have any dew on them at all. The car emits thermal radiation, and the tree absorbs/reflects some of that radiation back where the sky does not. The result is the exposed portions of the car can more easily shed the thermal energy and thus collect more dew.
95% Humidity areas away from civilization also have dense forests which trap the heat overnight.
And we do, in fact, pump a LOT of water into the air. It's on the same order of magnitude as would be expected for the observed warming.
[citation needed] - Gonna have to see where you're getting these numbers.
=Smidge=