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CO2 Part III - Carbon Dioxide Part III We ended Part II...

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Carbon Dioxide – Part III We ended Part II with the rapidly rising curve of observed CO 2 content of the atmosphere, as measured at the Moana Loa observatory. The rapid rise observed since about 1900 from 287 ppmv to 380 ppmv can readily be shown to arise from anthropomorphic (human) sources. While volcanoes add CO 2 and other gases to the air, they typical do so in short episodes, that can be a significant factor on world wide level, but which would only have a duration of months or possibly years, not decades. Furthermore, the rapid rise corresponds to the period when a similar rapid rise in fossil fuel use occurred on a massive scale. This scale, which is now at the level of ~85 million barrels of liquid hydrocarbon consumption per day world wide, is an ample source to account for the atmospheric increases. Indeed, it is larger than the atmospheric increases, and the difference can be accounted for by oceanic absorption of the remainder. The Moana Loa data also shows the effect of the summer growing season in the northern hemisphere, a positive sign that indicates CO 2 levels will fall when emissions do. The assignment of the source of CO 2 increases to fossil fuel consumption is also verified by the change in isotopic constituents in the ambient gases. Thus, it is well proven that rising carbon dioxide levels in the air are not from natural sources, but are clearly derive from human activity.
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