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If I am reading the study correctly, the experimental doses of CO2 reported as having symptoms were near 100% (albeit, for 2 minutes at a time). The "steep increase" in atmospheric CO2 over the past century has been from about 280 parts per million to 390 PPM. There is a vast difference between being knocked unconscious by 2 min of no oxygen and a continuous dose that's not yet measurable in parts per thousand.
Further complicating the analysis, the honey bee species is ... well, actually I'm having a hard time finding a reliable source but the consensus seems to be somewhere between 5 and 70 million years old. During that period, atmospheric CO2 was even higher than we see today. While we have no way of knowing what behavior those prehistoric bees exhibited, I am skeptical that significant toxicity or learning disability would be among the traits.
Mike Rossander
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