[Response: A further point here is that the Law Dome data are more extreme
wrt the CO2 drop in question, than are other high res.
BAU [
wrt CO2](Scenario A) called for an annual increase in anthro emissions of CO2 of 1.5 %.
Hi Anonymouse, I'm afraid it is pretty clear that you don't know what you are talking about
wrt CO2, photons and the greenhouse effect, so I will not argue with you about it.
The vostock data shows the opposite trend to the one you suggest and to my mind, direclty imply LOW climate sensitivity
wrt co2.
Request for clarification from a retired engineer: when it's said that methane is N times the greenhouse gas that CO2 is, is that purely taking into account their absorption spectra relative to the blackbody emission from the surface, or does it take into account saturation as well, since methane constitutes a much smaller percentage
wrt CO2?
Not exact matches
WRT the source of the
CO2, Brian has already pointed out the isotopic signature of the
CO2, but over and above this, we've produced about 2x as much
CO2 as has gone into the atmosphere!
WRT water vapor amplification, I suspect that the basic (radiative only) amplifying effect of water vapor, which is something less than a factor of 2 over the
CO2 - only effect of ~ 1.2 C, IIRC, will be close to the same across a range of average surface temperatures.
I happen to agree with Secular Animist and others that we need to cut
CO2 and other ghg emissions to as close to zero as quickly as possible at thsi point no matter what further bad news from science comes along
wrt said tipping points and feedbacks.
WRT 39, the person's comment was saying that
CO2 went up the amount in scenario A, but we got the warming in scenario B. I would think this is relevant (if so... I have not checked out the Hassen stuff yet... so please spoonfeed me the facts!)
3 - Why do we see,
wrt our current discussion on
CO2, is what appears to be a leveling off in the raw temp since 2000?
WRT to the (alleged) correlation between
CO2 and human longevity: correlation is not, as our denialist friends like to stress — on alternate days, anyhow — causation.
The geological evidence is that life (in general) is fairly robust
wrt atmospheric
CO2 levels, and indeed that from a geological perspective we are close to the bottom end of the range of both
CO2 and temperature ranges experienced in Earth history.
The use of the paper quoted in the head post by Judith, however needs to be heavily qualified in that natural variation vs man made variation
wrt to a trace gas such as
CO2 might not easily be resolved.
Emissions of
CO2 from burning fossil fuel is real whereas claims of there being anything more than barely discernable global warming from such emission is observationally challenged
wrt objective assessments of the EAS.
I'd suggest that the atribution of cause towards
Co2 (
wrt temp) has not been sufficiently «proven» in this situation due to the lack of real progress with the theory and the models.
And
WRT to the residence time of
CO2 in the atmosphere, individual molecules of
CO2 may have a relatively short residence time due to the carbon cycle but the overall level remains fairly constant and does have a residence time of centuries.
This is what must be done before ascribing relevance to any one small factor such as Man Made
CO2 wrt Atmospheric heating.
WRT the application of CDR, I observe that it entails about 3.66 times the tonnage of material as does Carbon Recovery, and does so in the form of liquified
CO2 rather than of inert charcoal optimized for use as a soil enhancer.
One is
CO2 fertilization and the other is N fertilization... either or both could occur and would increase in general at the same time and amount
wrt human fossil fuel burning.
Likewise the ongoing ~ > 16 non-warming controversial critical dialog
wrt AWG /
CO2 is legend.
> [T] he ongoing ~ > 16 non-warming controversial critical dialog
wrt AWG /
CO2 is legend.
Since the supposed
CO2 level during the MWP was around 280 ppmv and the
CO2 level now is about 380 ppmv, your statement
wrt sensitivity is nonsense.
Yes,
CO2 can accumulate to a saturation point
WRT surface temperatures.
Secondly: And some people are upset that there is scepticism
wrt the notion that man made emissions of
CO2 will cause global warming...