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He’s been a visiting professorships at Paris, Stockholm, Jerusalem, and Kyoto, and he’s spent time at the Bureau of Meterology in Australia.
Over the last two years he has been looking at C12 and C13 ratios and CO2 levels around the world, and has come to the conclusion that man-made emissions have only a small effect on global CO2 levels.
(Fossil fuels are, after all, made in theory from plants, so it’s not surprising that it’s hard to tell their “signatures” apart).
So if the C13 to C12 ratio is falling (as more C12 rich carbon is put into the air by burning fossil fuels) then we can’t know if it’s due to man-made CO2 or natural CO2 from plants.
It’s not just that man-made emissions don’t control the climate, they don’t even control global CO2 levels. No graphs are available from Salby's speech or paper yet.
CO2 variations do not correlate with man-made emissions. This graph comes from Tom Quirk's related work (see below).
The up and coming paper with all the graphs will be released in about six weeks.
Listen to the speech: “Global Emission of Carbon Dioxide: The Contribution from Natural Sources” Professor Murry Salby is Chair of Climate Science at Macquarie University.In other words, temperature controls CO2 levels on a yearly time-scale, and according to Salby, man-made emissions have little effect.