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NeilBlanchard · 05-03-13, 02:31 PM

Molten rock produces different carbon than burning "new" plants, and also different from burning "old" plants i.e. oil and coal and natural gas. Volcanoes release a different isotope (carbon 13), than does burning of fossil fuels (carbon 12), and wild fires releases a higher percentage of carbon 14 (the radioactive isotope) and since plants have a given proportion of carbon 14, we know that the increase in the atmosphere is coming from burning "old" plants.

The biggest increase of carbon in the atmosphere is carbon 12. And there is a a corresponding decrease in the level of oxygen, as well. So this confirms that the largest cause of the increase is humans burning fossil fuels.

Yet another confirmation is the basic math - there is not nearly enough carbon coming from volcanoes to account for the increase in the atmosphere.

05-03-13, 02:31 PM	#72
NeilBlanchard Journeyman EcoRenovator Join Date: Dec 2009 Location: Maynard, MA Eaarth Posts: 383 Thanks: 78 Thanked 39 Times in 32 Posts	Most of the carbon dioxide comes from humans burning fossil fuels Molten rock produces different carbon than burning "new" plants, and also different from burning "old" plants i.e. oil and coal and natural gas. Volcanoes release a different isotope (carbon 13), than does burning of fossil fuels (carbon 12), and wild fires releases a higher percentage of carbon 14 (the radioactive isotope) and since plants have a given proportion of carbon 14, we know that the increase in the atmosphere is coming from burning "old" plants. The biggest increase of carbon in the atmosphere is carbon 12. And there is a a corresponding decrease in the level of oxygen, as well. So this confirms that the largest cause of the increase is humans burning fossil fuels. Yet another confirmation is the basic math - there is not nearly enough carbon coming from volcanoes to account for the increase in the atmosphere.