An article weak on fact, and high in both discovery sensationalism and unproven theories.
They claim that it was the excessive amounts of methane in the atmosphere which made the atmosphere toxic - one can attribute that as a probable cause of the mass extinction. The only thing heat can be blamed for is releasing these noxious gases.
Where any correlation between CO2 and this extinction has me beat. Krakatoa, the largest eruption in modern times, caused global cooling not warming.
Sigh.
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