- when ?
were predicted and are predicted quite
often, not materialized, so most people donít take them
seriously. Some even take the prediction task as a way
of socializing. The field has been broaden substantially when
the predictions of human induced cataclysms were added to natural
ones - it became a sort of science, almost. If you are for some
serious reading, visit the website of Nick
made doomsday aside, what is the current probability of a natural
one? The graph below, where the time scale encompasses hundreds of
millions of years, gives a false sense of security because human
life span is so insignificant on that scale. But, look more
studiously: the five near-total extinctions of live species in the
last 440 million years are unevenly spaced, from 52 to 142 million
years apart, the last one (end-cretaceous) 68 million years ago.
We are in the range, arenít we?