# Did low $\small\sf{CO_2}$ levels affected Permo-Triassic mass extinction?

How did plants adapt to $$\small\sf{CO_2}$$ levels past 400k years? Why won't they do it again?

I know Permo-Triassic mass extinction is associated to a catastrophic event, but I wonder if, in terms of neocatastrophism, other factors, concretly $$\small\sf{CO_2}$$ low levels shown in this graph, were a prelude to Permo-Triassic mass extinction, affecting the basis of ecological chain at landmasses and oceans.

Source: Wikipedia. From Gradstein et al.,2005

Gradstein, FM, JG Ogg and AG Smith (2005) "A geologic time scale 2004", Cambridge University Press ISBN 0521786738

• No. The Permian-Triassic extinction was marked by a substantial INCREASE in CO2. "...an increase in CO 2 levels by 2000 ppm..." (from the Wikipedia article: en.wikipedia.org/wiki/Permian%E2%80%93Triassic_extinction_event which is why this is a comment, not an actual answer). – jamesqf Feb 27 '19 at 19:45
• @jamesqf my english use to be not very clear, but with a prelude to Permo-Triassic mass extinction I was refering to Carboniferous/Permian levels before the event. If the graph is related with the extinction or it was a totaly catastrophic separated event – user12525 Feb 28 '19 at 8:39