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Old December 6 2013, 12:53 AM   #6
iguana_tonante
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Location: Italy, EU
Re: Photosynthesis, hypothetical question

I'm too tired to look into the math right now, but atmospherically I would say that carbon dioxide accumulation would be quicker and more harmful than actual oxygen depletion.

But I agree that lack of food would be quicker than both.

(On the other hand, there are bacteria that don't need photosynthesis to survive. So it will not mean a total extinction of life. With time, more complex forms could evolve, resulting in a completely different evolutionary tree.)
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