Quote:
Originally Posted by CraigS
The causes for these extinction events are still very much up for debate, too.
They don't all have to attributed to surface or atmospheric temperature variations.
Cheers
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True....but a large asteroid impact, a global methane belch or increased volcanic activity will cause temp variations.
However, that they happened is fact and we only have a certain number of possible causes. We can take our pick and see which one (or more than one) occurred.