Comment Re:Why the myopic obsession with O2? (Score 1) 17
There's a lot of speculation about life as we don't know it. And that's what it is: speculation. While there are microbes that don't rely on oxygen, and one animal, they are utterly dependent on environments that do require oxygen. So no abiotic life origins here.
Without knowing for sure what to look for in a chlorine based life form even with it live in front of us, performing the forensic search with the body cold billions of years is all but impossible. We will get there some day but people are looking for signs unambiguous, and that means life as we know it.