The carbon-14 dating method is based on the assumption that the rate of production of 14 C

Question:

The carbon-14 dating method is based on the assumption that the rate of production of ¹⁴C by cosmic ray bombardment has remained constant for thousands of years and that the ratio of ¹⁴C to ¹²C has also remained constant. Can you think of any effects of human activities that could invalidate this assumption in the future?

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