You are correct, I made no mention of "survivability, I used the word "survive" as a reference to the Stanford quote---
View attachment 862945
--noting the phrase at the end "plants, which require a minimum of 150 ppm to survive". Please understand that I'm not asserting that the Stanford University is right which would make you wrong. My point is that the Stanford people are really smart, and assuming that you too are really smart means that some folks say "survive" and others refuse to. To me this phenomenon is inconsistent.
Understand that a hundred million years ago C02 was 2,000 ppm (aka 0.2%) while oxygen was 30% of the atmosphere. We had dragon flies w/ a 3-foot wingspan because the increased energy available. My thinking is that this would present a HUGE increase in human abilities, but in all reality this is just not something for our lifetime.