Fairly weak study, not a study
This is not a study, not really. A study would include real life observations or real data. This is a guess based on an impossible (per IPCC) model. First of all, the IPCC says that you cannot predict climate in the future (longer term) because of the nature of the climate system - a chaotic, non-linear coupled system. Secondly, the models contain assumptions regarding feedback loops that have been proven wrong so even short term predictions are not reliable.
As has been pointed out, the casual analysis appears to be deficient.
The only type of study that this can be called is a poor one.
I do marvel at the fact that supposedly smart inteligent people continue to publish things like this.
