Earth endured a million years of rain in the Carnian Pluvial Event
The primary driver behind this extraordinary shift in climate appears to be a massive volcanic eruption within the Wrangellia Large Igneous Province, stretching from south-central Alaska through the coast of British Columbia.
highlighted the eruption’s colossal impact on the atmosphere, with the discharge of greenhouse gases such as carbon dioxide triggering spikes in global warming
https://www.earth.com/news/earth-endured-a-million-years-of-rain-in-the-carnian-pluvial-event/