>>11928098How is it misleading?
~2 ppm * 20 = ~40 ppm CO2, which is ~10% of the CO2 in the atmosphere. And any increase in methane is 20x more significant than the same increase in CO2.
The paper I cited above that used the figure you keep refering to (which is from a sketchy source as it is) and then showed that it is very difficult to quantify the GWP of water.
Besides, it is not controversial that water is the most significant GHG. No one is arguing that it has a higher concentration and absorbs more radiation.
But, global water vapour concentration would not increase on its own (why would it?), and if it increased due to heating, then it cannot possibly be the initial cause of the heating.
Now we are back at the conclusion that, well, GHGs that have been increasing in concentration at a steady rate since the industrial revolution are probably increasing the greenhouse effect, causing the earth to warm, causing all the other feedback loops that cause more warming to occur.
So, again, what is your point?
