Quote:
Originally Posted by dcb
That is 6 gigatons per year, so we add about 1% per year, starting many years ago.
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That assumes that carbon dioxide isn't absorbed into the oceans or the biosphere.
If we go by that assumption, and then go on to state that Manmade carbon dioxide levels have increased since 1900 from 0% to 6% today, that would give about 330 gigatons of carbon dioxide added into the atmosphere. That would be about 44%, which at first glance sounds more reasonable for AGW. Then, when you realize that as a fraction of atmospheric concentration, you get 214.3 ppm, which is unrealisticly lower than the 280 ppm figure that is so-often quoted.
Alternately, you can assume that Mankind added 1% per year since 1900. That is, 1901 had 101% of 1900's carbon dioxide, and so on, and so on... What would 1900 levels have to be in order for this to be true? Hm... From my calculations, you'd have to start out with a total atmospheric inventory of 248 gigatons of carbon dioxide, or a concentration of 127 ppm.