Please explain what would contribute to such an event.
By such an event are you referring to the great oxygenation event(s) (GOE)? The first event (GOE) occurred around 2.4 Ga and the second one 2 Ga later know as the Neoproterozoic Oxygenation Event (NEO). Before then, especially the GOE, earth's atmosphere was devoid of free oxygen. With little to no oxygen, the only possible life was anaerobic, therefore microbial. What got things started was cyanobacteria which begin to form oxygen through photosynthesis. Of course there are quite a few other things that occurred as well, not just the oxygenation. Both events are also associated the extensive tectonic activity as well as only one supercontinent (Rodinia) located mostly in the southern hemisphere. The NOE occurred after the break up of Rodinia which formed Gondwana. Also between these two events was a snowball earth event as seen by a sudden plundge of pCO2.
For one thing, the earth wasn't formed with an oxygen atmosphere. As for the diversification of life, the anoxic environment and multiple snowball earth events pretty much put diversification on hold. It wasn't until the late Neoproterozoic with a warmer climate, deglaciation allowing sea levels to rise, where shallow seas could be formed along the continental shelves that life begin to diversify. Keep in mind that all life then was marine. We know the oxygen was different then from geochemical markers.And why such present day oxygenation was not the same back then for life to stop diversifying?
You will have to ask a biologist that.And does this mean by increasing oxygenation, we can evolve ourselves?
It is not a matter of knowing for sure, it is a matter of reading the geochemical markers and correlating them with the many known events along with the fossil record to understand what occurred and what seems to indicate why. These are all natural process that we know occurred and when.You have such proclaimed affirmation in the distant past as if you know for sure and yet I fail to see why the so called naturalistic mechanism such as oxygenation is not being used today to evolve man or life in general.
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