Alastair wrote:
> Yes, I gave you a bum steer referring to grasses. What I should have
> said was that the evolution of the C4 pathway could have been the
> cause or a contributing factor leading to the current Pliestocene ice
> age.
> http://en.wikipedia.org/wiki/C4_carbon_fixation
The C4 mechanism confers an advantage at low CO2, so it's more likely
that changes in C4 abundance during the Plasticine were driven by
fluctuations in CO2 than the other way around.
-rwa
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