>>So global extinction events were more important to determining how our world came about than one might have supposed... <<
Well, yeah.
All those caveman fires caused it to happen and women and minorities were hardest hit!
You forgot about all the evil SUVs -and the GloBull ‘warming’ that killed all the glaciers and the mammoths and such! AlBore warned us!! It happened before and it will happen again!
(pant, pant!) OK, breathing normally now. :p *grin*