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There probably have been small fluctuations, leading to an uncertainty of plus or minus ten percent, confirmed by dating objects of a known age.

However, the evidence does not support the creationist claim of large changes in the amount of carbon dioxide.

When the plant or animal that consumed the foliage dies, it stops exchanging carbon with the environment and from there on in it is simply a case of measuring how much carbon 14 has been emitted, giving its age.

If this is true, then many of our established historical timelines are thrown into question, potentially needing a re-write of the history books.

In a paper published to the , the team led by archaeologist Stuart Manning identified variations in the carbon 14 cycle at certain periods of time throwing off timelines by as much as 20 years.

The result is that carbon 14 is present as a constant percentage of the total carbon in the atmosphere, although it does change slightly depending upon the amount of cosmic radiation reaching the atmosphere.

However, a correction can be made on the basis of carbon 14 readings on items whose age is known from archeological records.

The possible reason for this, the team believes, could be due to climatic conditions in our distant past.

This is because pre-modern carbon 14 chronologies rely on standardised northern and southern hemisphere calibration curves to determine specific dates and are based on the assumption that carbon 14 levels are similar and stable across both hemispheres.Thus, measuring the degree to which the carbon 14 level is less than that in the atmosphere provides a measure of time since death.Mollusks, unlike plants et al., get the carbon for their shells from ancient carbonate and not the atmosphere. Therefore mollusk shells are inappropriate for carbon dating because they do not, even when alive, have C-14 at the level present in the atmosphere.To test this oversight, the researchers measured a series of carbon 14 ages in southern Jordan tree rings calculated as being from between 16.Sure enough, it showed that plant material in the southern Levant showed an average carbon offset of about 19 years compared with the current northern hemisphere standard calibration curve.It is entirely at odds with everything that is known about nuclear physics.

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