Why is that 40, years limit for carbon dating methods?
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There is more C in the atmosphere now than there was 40 years ago.
Now researchers could accurately calculate the age of any object made of organic materials by observing how much of a certain form of carbon remained, and then calculating backwards to determine when the plant or animal that the material came from had died.
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Description: Here is how carbon dating works and the assumptions it is based upon. Advancing technology has allowed radiocarbon dating to become accurate to within just a few decades in many cases.