Pros and cons of carbon dating
A further problem is that it is difficult to establish for certain whether the credits you are buying have been sold before. Environmentalists say the problems with offsetting are so major that they should be a last resort after you have reduced your emissions by other means.
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One form of carbon has atoms that are 14 times as heavy as hydrogen atoms: Carbon-14, or radiocarbon.
Carbon-14 is made when cosmic rays knock neutrons out of atomic nuclei in the upper atmosphere.
We first need to understand how radioactive dating is measured.