The "PC History of Modern Man" describes NO major Catastrophic events--it merely cronicles the dubious abuses of "the Coloured ones" by "the White Oppressors!"
WHAT "Catastrophic Events??"
Doc
Just for starters.
The 'long-ring' tree ring data for the last 10,000 years (Yes, the tree ring chronology has finally been filled out for 10k years) indicates that there were five worldwide catastrophic events within the last 10k years, the dates are: 3195BC, 2354BC, 1628BC, 1159BC and 540AD and two smaller events at 207BC and 44BC. Some refer to these events as 'near-extinction events.' (These dates, except for 540AD, are supported by the ice core data) The dates are no longer in question but the causes are still being debated.
The 540AD date does not have an acid layer (volcano) in the ice cores and this leads some to speculate that it was a comet/asteroid that crashed into the Celtic sea and began the Dark Ages.
About 7600 years ago the Black Sea was a huge fresh water lake within a very short time it became a salt water sea connected with the Mediterranean.