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"So its a thousand years except for the bulk of the cycle which is orders of magnitude longer."


Except that the rock cycle takes CO2 out of the system, and does it over a period of millions of years, while it adds a miniscule amount, again, over a period of millions of years.  The only way the rock cycle can have any effect such as what we are seeing in such a short period of time is when we disrupt it by digging it up or extracting that carbon and burn it in our cars and power plants.  And that, we most certainly are doing.


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