More on Carbon Isotopes

Here are two charts that take the C14 story back in time. You can see how the C14 ratio was declining from the early 1800s, then shot up as nuclear tests added C14 to the atmosphere. When the tests ended in the 1960s, C14 started to decline again. This is dispositive evidence that the extra CO2 has come from fossil fuels.




carbon14carbon14decline

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