If anyone has any references to this I'd appreciate having them and
learning something new. In my training I was taught that all plants doing
photosynthesis (including the cane sugar plant, beet sugar plant and all
flowering plants included) acquire their carbon from the carbon dioxide of
the air. The ratio of carbon-12, carbon-13 and radioactive carbon-14 in
carbon dioxide is constant worldwide and so in all living plants (and
animals and humans that consume them) this ratio is also constant. The
ratio only changes after the plant/animal/human dies and then the carbon-14
decay results in a lower amount of carbon-14 and this provides the basis
for dating very old archeological specimens up to about 30,000 years old.
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