Norman, you did not address either of my arguments. You only claim that web pages show a correlation between the time of Neanderthal population decline and the TOBA eruption. I tend not to put much faith in web-posted “facts,” but if you can give a peer reviewed journal reference, I will try to look at it but, at best, it will only be someone’s theory (He was not there and can’t be sure.) and someone else with more knowledge of the physics I give below surely has published the contradictory theory. So lets not bother to get into an argument about whose peer-reviewed expert is correct, even if you can find one who thinks TOBA caused an ice age. Correlation does not establish a causal relationship. If it did, you could conclude that fire trucks cause fires near them. To establish your claim that TOBA was the caused an ice age that killed most of the Neanderthals, you must both describe some mechanism that selectively killed these “hairy hominids” (your description) and yet spared my nearly hairless ancestors and also refute the physical mechanism that I claim establishes heating, rather than cooling, as the more probable effect of TOBA on climate (not next week’s weather which might have been colder.) My mechanism for claiming that TOBA probably warmed more than cooled is based on the greenhouse effect of electrically polarizable molecules like H2O, SO2 and CO2 which volcanoes produce in quantity and which strongly interact with heat radiation (absorb it) to reduce the normal radiative loss to space. I. e. if TOBA did anything to the climate, it made Earth more like Venus, which gets much less sun at the surface than Earth does yet is much hotter at the surface because of the greenhouse effect. Refute this physics and Venus example, if you can. Until you do so, it is your bubble that has burst. Stick as many webpages as you like that say “correlation” on my bubble and it will not burst.