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THEORY OF LAND BIOTA SAMPLING<br />

e INCREASE IN ATMOSPHERIC CO2 MAY BE DUE TO<br />

FOSSIL FUEL COMBUSTION OR FOREST CLEARING<br />

e SOURCE OF CO2 MAY BE IDENTIFIED BY CARBON<br />

ISOTOPES IN THE ATMOSPHERE<br />

- C -13 IS PRESENT IN FOSSIL FUELS<br />

AND PLANTS<br />

- C-IkIS PRESENT ONLY IN PLANTS<br />

9 MEASURING RELATIVE CHANGE OF C-13 AND C -14<br />

IN STORED BIOMASS CAN YIELD INFORMATION ON<br />

THE SOURCE OF THE C0 2 THA'T WAS PRESENT<br />

DURING PLANT GROWTH<br />

App. 814

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