'Why is the IPCC so certain that the 5 percent human contribution is responsible for annual increases in carbon dioxide levels?'
Atmospheric physicist Murry Salby: 'In Salby’s view, the evidence actually suggests that the causality underlying AGW should be reversed. Rather than increased levels of CO2 in the atmosphere triggering global temperatures to rise, rising global temperatures come first—and account for the great majority of changes in net emissions of CO2, with changes in soil-moisture conditions explaining most of the rest.'
'Temperature appears more likely to be the cause, rather than the effect, of observed atmospheric changes.' -- 'Salby hasn’t been working in a vacuum. Swedish climate scientist Pehr Björnbom has replicated his finding that temperature drives CO2 emission. University of Oslo geosciences professor Ole Humlum published a landmark 2012 paper demonstrating that changes of CO2 follow changes of temperature, implying the same cause and effect.'
'As an academic critic of the science on which AGW rests, Murry Salby may have been silenced for now. The observed behavior of nature, from which he draws his analysis, cannot be dismissed so readily.'