Flood Basalts?

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This rules out flood basalts, large effusions of lava that can spend a million years or so scorching the earth and massively altering the climate.
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https://intuitivefred888.blogspot.com/2018/07/here-is-what-supervolcano-actually-is.html

When I tried to load "Flood basalts" it wouldn't load so the only way you can get it likely is to click the "Flood Basalts near the top that is a word button in a line there.

The actual article name you could also look up if the word button doesn't work is:

The World's Greatest Mass Extinction Was Caused By Volcanic Climate Change