https://en.wikipedia.org/wiki/C4_carbon_fixation#The_evolution_and_advantages_of_the_C4_pathway … C4 carbon fixation, a fundamental change in photosynthesis, evolved 35 MYA, became dominant in the tropics 6-7MYA. Compared to how long plants have been around that's nothing. To me it also seems too close to the evolution of sapience to be a coincidence.
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Yeah, higher atmospheric oxygen could be the common cause both of C4 carbon fixation and the flourishing of "higher" life like mammals.
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