Are We At A Point Where Any Major Disaster Could Spell The End?

[PunkMaister]

Originally Posted by Spock

Not a super volcano, a basalt rift would kill us with hydrogen sulfide and large ammounts of CO2. The current CO2 levels are what we've got to worry about, extreme disasters like asteroids, however deadly are largely irrelevant.

Maybe you didn't understand the OP of this thread which as if the cumulative effect of what is already present in the atmosphere plus what such a disaster would cause, would make things far worse had the current CO2 levels not being present.

You seem to be obsessed with a so called basalt rift. I've checked and all I can find is some obscure references to underwater oceanic volcanic rifts. Basalt is a volcanic rock. Now no current volcanic rift would or could produce as much ejecta in a single eruption as a Super volcano can. Hydrogen sulfide although it is produced bu volcanic eruptions geologically speaking it has never been released in the quantities you describe, not even the last super volcano eruption produced that kind of an amount. My concern would be all the methane that now lies in a frozen state in the bottom of the oceans, because a super volcano or asteroid could warm up the ocean to the the point where all that methane is released and once that happens the Earth would broil as the temperature could rise as much as 10 degrees or more.