It Doesn't Prove An Old Earth Many people mistakenly believe carbon dating can be used to date objects that are millions or even  C-14 is formed in the earth's upper atmosphere as a consequence of cosmic radiation bombardment.
11 Dec 2007 Carbon-14 in coal deposits and in diamonds indicates a young earth which is why carbon-14 dating is not used to date material that is likely beyond this age. C14 dates · Biologists think that Carbon 14 proves evolution
9 Jan 2016 Carbon-14 dating gives unreliable results. Source: Thank you, Talk Origins for proving the point of the claim. They are The "misuse" claim is an excuse to explain away a result that doesn't fit the evolutionary orthodoxy.