Re: The permian extinction 200 million years ago ice or fire?

RonO wrote:

https://www.sciencedaily.com/releases/2024/10/241028164257.htms
 These researchers think that the cold periods after the massive volcanic eruptions cause the mass extinction 200 million years ago.  Massive amounts of carbon dioxide were expelled into the atmosphere, but they think that the huge amounts of sulfates caused rapid cooling more than once during these massive eruptions and that it was the cold that life on earth could not survive.

Certainly sulphate aerosols act more rapidly than greenhouse gases.
Work on a site at the K/T border in Colorado shows first a shower of
small debris, then a cold period (frost damage evident in aquatic plants
gives an approximate time of year of July), followed by a slow prolonged
warming.
So Fire and Ice, not to mention wind and shock waves.
William Hyde