Why not C4 Photosynthesis?

Gilbert Douglas gfdouglas at earthlink.net
Thu Oct 15 16:34:59 EST 1998

Perhaps someone can tell me.  From what I have studied, C4 photosynthesis is
much more efficient than C3 photosynthesis, so why is it that C4
photosynthesis hasn't taken over to become the dominant process on the

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