JoNova tells us that this post is a blockbuster – I can see why. It is not recent but has a lot of follow up interest

This so-called ‘settled science’ is riddled with holes. The ‘sceptic’ group keep coming up with sound arguments in just about all areas of the science, proving that there is no settled science. In fact it is probably plainly far from legitimate science.

Professor Murry Salby is Chair of Climate Science at Macquarie University. 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. It’s not just that man-made emissions don’t control the climate, they don’t even control global CO2 levels.

CO2 variations do not correlate with man-made emissions. Peaks and falls correlate with hot years (e.g. 1998) and cold years (1991-92).  No graphs are available from Salby’s speech or paper yet. This graph comes from Tom Quirk’s related work (see below).

The higher levels of CO2 in recent decades appear to be mostly due to natural sources. He presented this research at the IUGG conference in Melbourne recently, causing great discussion and shocking a few people. Word reached the Sydney Institute, which rushed to arrange for him to speak, given the importance of this work in the current Australian political climate.

That’s the gist of it, read the whole article here, and enjoy!