I remember hearing somewhere in the news about a point of global warning inducing photosynthetic failure in plants, particularly the aerobic algae in the oceans, at a certain temperature. Looking at the timeline at least listed on https://en.wikipedia.org/wiki/Geologic_temperature_record Earth has definitely had warmer periods in the past, yet an oxygenated atmosphere has persisted.

I'm not a skeptic of climate change, but I don't see what supports this particular claim of photosynthesis given that animals and oxygen have successfully survived through multiple warming periods in Earth's history.

  • 1) Oxygen level has varied quite a lot too (Wikipedia > Geological history of oxygen) 2) temperature variation in geological times have caused mass extinction in the past. Yes, some lineages survived but many disappeared. Nothing so reassuring about that! – Remi.b Aug 9 at 21:22
  • Your last paragraph seems somewhat unrelated to the main question and might just lead to unclear discussions. The core of your post does not contain any question. Can you please try to highlight a single, clearly defined question and to make sure that the rest of the post is about this question and not some side track consequence of a possible answer to the question? – Remi.b Aug 9 at 21:26
  • The question I want addressed is the title question, which is often the case, hence the reason stackexchange allows titles. The body of text is just the context, which is: how have increasing temperatures in previous periods of Earth affected the effectiveness of photosynthesis for the survival of animal species? – Vane Voe Aug 10 at 6:54

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