Sorry, to be clear: carbon-14 makes up about 0.0000000001% of the carbon in the atmosphere. It peaked at twice that much in 1963, thanks to nuclear testing in the 50s and 60s, and you can discover some interesting things about the environmental carbon cycle from that.
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But the takeaway here is 'human detection methods have gotten really good', not 'this number actually means anything'.
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. Banned in Sweden. SubGenius, Zhuangist, white-hat troll. Defrocked mathematician. Brain problems.