262 comments on Global Warming - a review and a Conference Conclusion
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Huh? According to this Wikipedia article, the earth's carbon is 98.9% C-12, and 1.1% C-13. How could the ratio of C-12 to C-13 be anything like 75%? I thought the only thing that changed over time was the concentration of C-14 (which is present in minute quantities)? Am I missing something here?
http://en.wikipedia.org/wiki/Carbon
I imagine you know this already, but 75% of carbon being C-14 was not what was said. Only a very tiny percentage of carbon is C-14. C-14 has a half life of about 5730 yrs consequently all of the C-14 in fossil fuels has decayed, i.e. there is no C-14. Consequently as the burning of fossil fuels has added C-14 free carbon to the air, the proportion of carbon that is C-14 has dropped considerably. If you were carbon dated today using the standard curves developed for the past, they would announce you had died several thousand years ago. The 75% number is the estimate of the fraction of increased carbon that is from fossil fuels. I was surprised by this number as it implies 25% of increased CO2 is from natural carbon sinks – not good.