Global Emission of Carbon Dioxide: The Contribution from Natural Sources by atmospheric physicist Professor Murry Salby, Chair of Climate, Macquarie University, talking at the Sydney Institute, on his conversion from agnostic to skeptic by his recent results on the natural origin of declining C12/C13 ratios in atmospheric carbon dioxide.
In his paper due out in early 2012, he claims results that invalidate the main conclusions of the IPCC 2007 report called the AR4. Previous research showing humans are responsible for emissions of CO2 is wrong. Increasing CO2 is not ‘driving the climate bus’ but is very much in the back seat to temperature. Natural processes alter isotopic ratios similar to expected from burning fossil fuels.
Here for abstract and cable times.