¿Are the Venusian sulphuric acid clouds the by product of long dead anoxogenic photosynthetic organisms?

I just read the piece at the link below entitled "Study: Life might survive, and thrive, in a hydrogen world."

I'd been thinking on similar lines recently, on different atmospheres with early life, but I was considering anoxogenic bacteria whose byproduct is sulfur instead of molecular oxygen. ¿Had life evolved on Venus could its sulfuric clouds be the signature byproduct of such life with no branches ever evolving to produce the equivalent of Earth's Great Oxidation Event and eventually creating a runaway greenhouse effect?

Study: Life might survive, and thrive, in a hydrogen world  news.mit.edu/2020/study-life-hydrogen-world-0504

Anoxogenic photosynthesis https://en.wikipedia.org/wiki/Anoxygenic_photosynthesis

Clouds on Venus https://www.universetoday.com/36871/clouds-on-venus/

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Comment by Andrew Planet on May 20, 2020 at 12:24pm

Relative to water causing a runaway greenhouse effect, I forgot to add what I had in my imagination if that happened. If the gases in an atmosphere of a world with a substantial enough if not major part  of water vapour did lead to a runaway greenhouse effect did would water clouds envelop the earth to the extent that it would shade the Earth and cool it down and so reach atmospheric homeostasis at a level always hospitable to life?


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Comment by Andrew Planet on May 20, 2020 at 12:04pm

I read a bit on the Gaia hypothesis as recommended by Dr. Graham Lau and quite liked its approach in portraying "living organisms interacting with their inorganic surroundings on Earth to form a synergistic and self-regulating, complex system" that perpetuates itself.  ("Quoted from Wikipedia")

I'm no expert but feel safer emphasizing the hydrodrophere as coming first and foremost for that self regulation to take place rather than it be relegated to an inorganic system merely made stable by life on Earth, as I read the Gaia Hypothesis does. Personally, I wonder if the hydrosphere is what makes everything else stable since before life arose on Earth and continues to do  so, with perhaps Venus as an example of not enough initial water having been present in its nascent past.  In other words, perhaps with enough large amounts of water on a world , itself being an effective greenhouse gas in vapor form and  possibly the most abundant if that were the case, would that quench any potential runaway greenhouse effect?

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