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Politics : View from the Center and Left -- Ignore unavailable to you. Want to Upgrade?

To: Ilaine who wrote (17283)	4/28/2006 1:52:47 PM
From: Mary Cluney	Read Replies (2) \| Respond to of 541470

is it true that ice core samples are closed systems, so that one can accurately measure the amount of CO2 in ancient atmospheres? This stuff is way beyond me. Fossil fuels contain practically no carbon 14 (14C) and less carbon 13 (13C) than air. CO2 coming from fossil fuels should show up in the trends of 13C and 14C. Indeed, the observed isotopic trends fit CO2 emissions from fossil fuels. The trends are not compatible with a dominant CO2 source in the terrestrial biosphere or in the ocean.