A very good point Noumenon .But any effect on the amount of oxygen hasent had time to show its self yet as the margirty of earths oxygen comes from a
type of phytoPlankton. (looked it up)
In conclusion the oxygen will remain realtively the same untill a large drop of these ocean plants . Ps All land plants produce oxygen ONLY
during the day and obsurbe oxygen at night the net gain is near 0 .
The point being you could pave ever bite of dry land and the o2 wouldnot drop much .
But you kill the oceans even if the land is green we still die .
Pss we are killing the oceans so eventuly a drop in o2 can happen but even with the oceans compleatly dead it will take thousands of years to get to
the point were you cant breath .
pss the air is 79% nitrogen 20% oxygen and 1% other.
and we would be just fine at 10% oxygen and start dieng once it gets below that.
They are used to tell what the composition of the atmosphere was in the past.
I haven't thought about changing oxygen levels. If it is significantly changing that would be very big news.
I would guess if any credible evidence to that effect showed up someone would probably say something.
If you do hear anything along those lines i [and probably anyone/thing who breathes] would be interested in hearing about it.
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