The only similar example I can think of is when, roughly 2400 million years ago (during the Paleoproterozoic iirc), the ancestors of cyanobacteria poisoned their atmosphere by overproducing oxygen which resulted in an extinction event. But that whole process still took somewhere in the order of millions of years to complete I believe.
> But that whole process still took somewhere in the order of millions of years to complete I believe.
The geological evidence is that that oxygen build-up first had to exhaust things that took the reactive oxygen out of the air and water. Iron oxide was laid down as huge deposits of "banded iron ore" The great rust. (1)
This is hard to get an exact number on, but as far as I know, it is estimated to have taken at least 500 million years.
And then oxygen increased again, a billion years later (2)
It was not fast. It was measured in 100 million year ticks.
The only similar example I can think of is when, roughly 2400 million years ago (during the Paleoproterozoic iirc), the ancestors of cyanobacteria poisoned their atmosphere by overproducing oxygen which resulted in an extinction event. But that whole process still took somewhere in the order of millions of years to complete I believe.
> But that whole process still took somewhere in the order of millions of years to complete I believe.
The geological evidence is that that oxygen build-up first had to exhaust things that took the reactive oxygen out of the air and water. Iron oxide was laid down as huge deposits of "banded iron ore" The great rust. (1)
This is hard to get an exact number on, but as far as I know, it is estimated to have taken at least 500 million years.
And then oxygen increased again, a billion years later (2)
It was not fast. It was measured in 100 million year ticks.
1) https://en.wikipedia.org/wiki/Great_Oxidation_Event#Banded_i...
2) https://en.wikipedia.org/wiki/Neoproterozoic_oxygenation_eve...
Faster? Do you have an example? What species can add 10^12 tons of any chemical in just few hundred years?
There were geological events and asteroid impacts that may result in more dramatic changes, but their signatures will be different.