On the subject of "CO2 and O2 tolerance of food crops" the only relevant article I found is
(excerpt)
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Under anaerobiosis, coleoptiles develop fast, whereas root growth is suppressed (Alpi & Beevers, 1983), indicating that O2 deficiency restricts rice root development and seedling stand in soil. Root growth is initiated as coleoptiles approach the water surface, where O2 levels are higher (Ismail et al., 2009; Fig. 2b), indicating that O2 acquisition may facilitate root development.
Having been brought up and educated in traditional Christian fashion, a major issue has been how to explain why initially the recommended diet was vegan whereas later that became omnivorous.
The evolutionary evidence is that primates no longer can access vit B12 from intestinal production but have to obtain it from animal sources or consuming their excrements. Apart from that, the metabolism "fit for meat" uses uricase to detoxify ammonia whereas in primates, uric acid functions as antioxidant and uricase enzyme is absent.
So there might have been an era where vegetation became scarce to the extent that the metabolism of primates changed irreversibly. The implication is that archeologists still could discover humanoids who could have been thriving on a vegan diet, and what that diet was.
What might survive the grave / "reincarnates" is (part of) memory. All memories (up to cosmic level) are like pearls on a single string. Find out who / what the string is.
That implies you might be familiar with questions like "how can a fish know it has been immersed in water all its life? and analogies like "A salt doll once went to the sea. Then went on a swim and its last words were "this all is "me"".
About 21 years ago, riding my bike home at night from studying Tibetan "Bardo" (between-life) teachings, I had an epiphany that we are all, always "dead", but sometimes we are also "alive" and it is Extremely Distracting.
I peeked and saw that you are a "retired electronics designer". That's a big world. I designed and built vacuum-tube audio components, low powered single-ended amps and high-efficiency speakers for fun for some years.
On the subject of "CO2 and O2 tolerance of food crops" the only relevant article I found is
(excerpt)
---
Under anaerobiosis, coleoptiles develop fast, whereas root growth is suppressed (Alpi & Beevers, 1983), indicating that O2 deficiency restricts rice root development and seedling stand in soil. Root growth is initiated as coleoptiles approach the water surface, where O2 levels are higher (Ismail et al., 2009; Fig. 2b), indicating that O2 acquisition may facilitate root development.
https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.16395
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Having been brought up and educated in traditional Christian fashion, a major issue has been how to explain why initially the recommended diet was vegan whereas later that became omnivorous.
The evolutionary evidence is that primates no longer can access vit B12 from intestinal production but have to obtain it from animal sources or consuming their excrements. Apart from that, the metabolism "fit for meat" uses uricase to detoxify ammonia whereas in primates, uric acid functions as antioxidant and uricase enzyme is absent.
So there might have been an era where vegetation became scarce to the extent that the metabolism of primates changed irreversibly. The implication is that archeologists still could discover humanoids who could have been thriving on a vegan diet, and what that diet was.
I was a small vole-like critter back then, but I've reincarnated quite a few times.
This is basically better.
What might survive the grave / "reincarnates" is (part of) memory. All memories (up to cosmic level) are like pearls on a single string. Find out who / what the string is.
If I am a dream character...
What is my relation to the Dreamer?
(Yeah, a trick-question. The analogy is likely over-simplified.)
If "the enlightened one" loses a finger, will the finger still be enlightened?
(Simplified trick answer).
You KNOW the answer, which exists before, during and after the question (which panders to a common illusion).
;-}
That implies you might be familiar with questions like "how can a fish know it has been immersed in water all its life? and analogies like "A salt doll once went to the sea. Then went on a swim and its last words were "this all is "me"".
About 21 years ago, riding my bike home at night from studying Tibetan "Bardo" (between-life) teachings, I had an epiphany that we are all, always "dead", but sometimes we are also "alive" and it is Extremely Distracting.
Donovan: https://www.youtube.com/watch?v=U9FreigQ8jc
I peeked and saw that you are a "retired electronics designer". That's a big world. I designed and built vacuum-tube audio components, low powered single-ended amps and high-efficiency speakers for fun for some years.