This is basically some college kid’s term paper, using unspecified computer modeling. I wonder if the researchers used “Sim City” or “Civilization 3” to do the calculation.
This same science has long been used to prove the increased birth rate that follows extended periods of power outage.
Comparing one period of time to another lacks all semblance of scientific control.
This is another perfect example of proofs based on lies, then, damn lies, and, finally, statistics.