Articles like these and authors like these are why I pay premium membership in medium!

I have never imagined or thought that oxygen comes from these algae and sources like this. If thats the case, do we have higher levels of oxygen near the oceans? Noob question, but delving a bit more on the aspects of oxygen quality and levels near ocean-areas may be more interesting as a followup. Or a pointer to any interesting research happening in these areas may be good as well.