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Originally Posted by Cato
What is "current"?
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The last decade is the best example - co2 levels are rising at only about half of human emission rate. Without human emissions co2 levels couldn't be rising.
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And how do you know that "without human emissions CO2 levels would start falling?"
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Because nature is absorbing more co2 from the atmosphere than it is emitting into it. Therefore left alone co2 levels in the atmosphere would start falling. They only rise because human co2 emissions (~28 billion tons per year) are double the net rate of natural absorption (~15 billion tons per year)
The reason nature is absorbing more co2 than it is emitting is because there is an abundance of co2 in the atmosphere at this time.