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Global Carbon Isotope Distribution<br />

Atmosphere<br />

C-l 3<br />

C-12<br />

-0.7%<br />

C-14 _<br />

C-12 = 40%<br />

X<br />

Fossil Fuel<br />

C-13<br />

C-12<br />

C-14<br />

C-12<br />

= -2.7%<br />

= -100%<br />

- -0.5% C-14<br />

C-12<br />

A<br />

\r<br />

C-12 *<br />

7o<br />

•Terrestrial Biosphere<br />

C-14 .<br />

C-T2 "<br />

Oceans<br />

C-13 O<br />

C-12 [<br />

•<br />

-10 to -20%<br />

Atmospheric Carbon Isotope Ratios<br />

CD<br />

CL]<br />

o<br />

O<br />

in<br />

O<br />

csj<br />

Year<br />

App. 815

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