Linking your research to CO2 or climate change helps in getting funded, the parent comment is sarcastic but it brings up a good point IMO.
It doesn't even mean the authors think there is any actual implication for CO2 or that they are being dishonest, in many cases the system has to be gamed like this if you want to be able to do research at all.
It's not that silly of a claim. Some farmed fish require a 20:1 wild fish feed conversation ratio. Modern salmon genetics (and feeds and culture techniques) have brought that down to essentially 1:1. If hybridisation resulted in a caviar producing animal that grew significantly faster and or produced more eggs than the sturgeon currently does...
