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"In contrast to recent claims, trends in the airborne fraction of anthropogenic carbon cannot be detected when accounting for the decadal-scale influence of explosive volcanism and related uncertainties."

I don't get it. Yes, volcanism can affect the climate through the release of aerosols that partially block out the sun and tend to counteract the effects of greenhouse gases. But how does that change the amount of anthropogenic carbon going into the air or change the action of the CO2 sinks?

The world is burning 8 billion tons of coal per year, and over 88 million barrels of oil a day. Just where do the products of combustion end up, anyway? Some of the CO2 gets taken up by trees. Some of it gets dissolved into the oceans, which is observed by the change in pH. But the Mauna Loa observatory is definitely measuring an increase in atmospheric CO2 every year. How much the measured increase is going to affect the world's climate is open for debate, but it makes no sense to say the "airborne fraction of anthropogenic carbon cannot be detected".

- Pete
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