Ole Humlum on CO2 Lagging Temperature
Ole Humlum published a paper about 10 years ago attempting to show that CO2 always lags temperature and therefore the increase in CO2 substantially comes from an increase in temperature, not the other way around. In the words of Humlum's paper, As cause always must precede effect, this observation demonstrates that modern changes in temperatures are generally not induced by changes in atmospheric CO2. Indeed, the sequence of events is seen to be the opposite: temperature changes are taking place before the corresponding CO2 changes occur. and CO2 released from anthropogene [sic] sources apparently has little influence on the observed changes in atmospheric CO2, and changes in atmospheric CO2 are not tracking changes in human emissions. From this, he concludes that temperature is causing the increase in CO2, meaning that CO2 can't be driving the increase in global mean temperature. As the theoretical initial temperature effect of changes in atmospheric CO2 must materialize fi...