Well according to the Wikipedia article on the Permo-Triassic extinction, widespread ocean anoxia can encourage anaerobic green sulfur bacteria to produce tons of H2S, which damages the ozone if it gets into the atmosphere (besides just generally being toxic).
Quote:
Originally Posted by Ulzgoroth
If you sweep earth that way there's going to be some serious property damage.
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They did say they're looting the
ruins of Lucifer-3. Only really hitting one hemisphere is a bigger argument against it.
I'm liking the "colliding binary neutron stars" idea.
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I have Confused and Clueless. Sometimes I miss sarcasm and humor, or critically fail my Savoir-Faire roll. None of it is intentional.
Published GURPS Settings (as of 4/2013 -- I hope to update it someday...)