Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age.The older a sample is, the less (the period of time after which half of a given sample will have decayed) is about 5,730 years, the oldest dates that can be reliably measured by this process date to around 50,000 years ago, although special preparation methods occasionally permit accurate analysis of older samples.The idea behind radiocarbon dating is straightforward, but years of work were required to develop the technique to the point where accurate dates could be obtained.Carbon dating involves measuring very small radioactivities.

A technique called mass spectroscopy enables the carbon-14 and carbon-12 atoms to be counted directly. By finding the proportion of carbon-14 atoms remaining you can calculate the age of the sample.We see that the correlation between CO2 and temperature is no more significant today than it was ages back when there were no automobiles and industry.The author also goes into the effects of the ocean and sunspots.His article did not give support for that particular statement, other than the correlation.Why would a CO2 increase be caused by a temperature increase?For example if there are only 25% of the carbon-14 atoms to carbon-12 atoms that there are in the atmosphere then the sample must be 2 half-lives old.

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