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Response to Finishline42 (Reply #7)

Wed Apr 8, 2020, 08:32 PM

8. On balance, no. Naturally there are variations (monthly and annual) . . .

An occasional flat YOY change (early 1960s, IIRC). But the overall trajectory is upwards, year after year.

We also know that it's us because of carbon isotope balances.

Since coal, oil and gas contain no Carbon 14, burning lots and lots of fossil fuels means that over time, the amount of Carbon 14 in the atmosphere has declined as the amount of Carbon 12 has risen.

NOAA does a better job on this than I do! More cool science below:

https://www.esrl.noaa.gov/gmd/outreach/isotopes/mixing.html

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