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Originally posted by Portugoal
but we've got about 16 million years until the next one
Originally posted by theability
reply to post by Portugoal
Let me get this straight:
Every 27 million years life gets wiped out, we have 16 million to the next one.
27 - 16= 11 million years ago there was a mass extinction?
I don't remember one at that time, but I do remember one that happened 63-65 million years ago.
And for the record there has been 5 extinction events in the last 540 million years. Or one every 108 years.
These are known as the BIG FIVE.
I wonder how they come to these new conclusions?
The classical "Big Five" mass extinctions
The Holocene extinction is the widespread, ongoing extinction of species during the present Holocene epoch.
scientists estimate that during the 20th century, between 20,000 and two million species actually became extinct, but the precise total cannot be determined more accurately within the limits of present knowledge. Up to 140,000 species per year (based on Species-area theory) may be the present rate of extinction based upon upper bound estimating.
In broad usage, Holocene extinction includes the notable disappearance of large mammals, known as megafauna, starting 10,000 years ago as humans developed and spread. Such disappearances have normally been considered as either a response to climate change, a result of the proliferation of modern humans, or both
Overall, the Holocene extinction is most significantly characterised by the presence of human-made driving factors and climate change.
Originally posted by Phage
The premise is not based on actual extinction events but on a loss of biodiversity in the fossil record.
"Life on Earth is wiped out every 27 million years – and we have about 16 million years left until the next extinction, according to scientists.
Research into so-called ‘extinction events’ for our planet over the past 500 million years - twice as long as any previous studies - has proved that they crop up with metronomic regularity."
No, did somebody say that it had to be cosmic?
Does that single domino, the first one, have to be the result of a cosmic event?