Our human ancestors almost became
extinct about 900,000 years ago, dwindling
to a population of less than 1,300
adults of reproductive age because of
droughts, research has suggested.
Our early ancestors then spent
100,000 years teetering on the brink of
extinction, with 98.7 per cent of their
population having been wiped out,
possibly by catastrophic climatic
changes that led to a build up of ice at
the poles and prolonged droughts, a
Idę czytać dalej.