Assertion: extinction's cause | /r/CapableOf | describe a sequence of catastrophes
Facets:
value: each worse than the last
type: OTHER
Source sentences:
text: Possible causes supported by strong evidence appear to describe a sequence of catastrophes, each worse than the last: the Siberian Traps eruptions were bad enough alone, but because they occurred near coal beds and the continental shelf, they also triggered very large releases of carbon dioxide and methane.