What do we mean by:
 Ecosystem / Food chain collapse
 Economic (Capitalism's?) collapse
 Population collapse
 Civilisation collapse
Hopefully, from the comments I'll be able to discern what the next blog item in this thread should be.
Also, perhaps someone will suggest what sort of domino effects might be lurking and what other factors might impact on any of the above items.
And if this blog post is just too bloody daft, it's OK to tell me that as well.