That's why there's twice as much of it in the air now as there was a hundred years ago.
The residence time is rising, as the breakdown cycles overload - methane is building up in the atmosphere. It's higher now than it was, it's increasing, and the increase seems to be accelerating. This is partly a consequence of the CO2 boost causing faster natural release of methane, and partly due to the direct anthro boost of methane itself that accompanies the CO2 boost.
Of course, a permanent release of methane will lead to a higher level even if it is destroyed with time.
You have had no experience with the thresholds in the article, or any of their consequences (also described in the article). You said you had, but you described some irrelevant borders of climate zones on mountains - so it's clear that you have not.
It is clear, and was explained, that my experience was with other thresholds (related with temperature and wind, not aridity) and their consequences. But the mechanism how these other thresholds lead to the borders between the different ecosystems is the same, namely, the relevant parameter changes continuously, and at the line where this parameter has a threshold appears a border between the ecosystems. This is quite trivial. Consider a non-constant, continuous level of aridity. There will be regions where it is below the threshold, and others there it is higher than the threshold. In both parts there will be the corresponding ecosystem. Their borders will be at the places where the aridity has the level of the threshold.
Given that this thing is so trivial, so primitive, I think you understand this very well, and you simply don't want to admit this. Your technique of endless repetition of "you don't understand this" and "you have not read" nonsense is a cheap attempt to hide that you cannot argue with the simple logic of the argument.
The quotes are not even falsehoods, let alone lies.
They are clearly false, and because I have in essentially all cases already repeatedly corrected these falsehoods, repeating them again is already an intentional distribution of these falsehoods, thus, lies.
If it remains "like today", it will continue to accelerate as it is doing today - and 2.4 meters would force hundreds of millions of people to move or die.
If it remains like today it does not change, thus, not accelerate. And, no, 2.4 m would not force hundreds of millions of people to move.
Even 30 cm that quickly would do severe damage, forcing the evacuation of many large coastal cities and destroying most river delta farming (some of the most productive on the planet).
Nonsense. 30 cm higher than expected is something easily dealt with if there is a flood if there are enough bags with sand prepared for such cases. In a hundred years, it is nothing. And river delta farming can be protected too. The Dutch are doing this since medieval times.
All that was your invention - nobody but you "defined" any such thing.
The 20% were defined in the article - regions becoming more arid and crossing thresholds. I have simply added the two other possibilities: regions with small changes so that no threshold is crossed, and regions becoming less arid and crossing thresholds. The two numbers are some unknown n, namely the n% not crossing thresholds, and the remaining number is, then, defined by (80-n)%.
You don't like this elementary definition, because whatever you would propose as the n, you would lose.
You have. ... And this has been pointed out to you four or five times now.
Quote me with link to the source, liar. Repeating falsehoods four or five times, despite corrections, is clearly distributing intentional lies.
you don't know how it's funded or by whom, and you don't know what kinds of career pressures on AGW researchers are most powerful.
And I don't have to care because I do not use arguments which depend on funding.
My general argument is that short time jobs for young scientists are catastrophic, they force young scientists, in their most productive years, to follow the mainstream of science instead of developing alternative approaches. This general economic argument works completely independent of the particular sources of the grants and so on, it is not the claim that they follow the ideological prejudices of the particular grant givers. If the grant givers would like to have followers doing research in their interest, they would have to give them permanent jobs. Without this, the scientist has to care, from the start, about the next job after the grant too, thus, he will follow the mainstream, not that particular grant giver.
You have no idea what the "mass media" (you are omitting the largest and most influential media operations) are hiding about AGW, because you don't know what's there to hide.
There may be many more positive things I don't know. But I know enough positive things, and I have never seen them in the mass media. Except in some cheap attempts to diminish them in polemics against "deniers" (which there never allowed to deny themselves, one should not give such evil deniers any platforms, you know).
The living beings we are and rely on are our concern, not all possible forms of life that have been or could be.
The rate of increase of the CO2, not the absolute amount it will eventually reach, is what's threatening us now.
But, sorry, it is the absolute amount which defines how many corresponding acid there will be. If you think differently, explain, and please with a reference to a paper where the problem is explained. And if the acid corresponding to 2000 ppm is not problematic in itself, then why is some fast increase in a much lower region a problem?
Quote with link to the source, liar.
Further "you know nothing" bs disposed of.